Updated for the 2026/27 season. Few things spoil a trip faster than a stomach upset, and in most cases the cause is plain: water. A glass of tap water, a drink with ice or a salad rinsed under the wrong tap is enough to cause the so-called "pharaoh's revenge" in Egypt or "Delhi belly" in India. The usual symptoms are diarrhoea, dehydration, abdominal pain and weakness, and together they can cost you several days of a holiday you planned for months.
This guide gathers the rules that work in any exotic destination, whatever your country of origin: how to judge water quality, which sources are safe, how to treat water with tablets, filters, UV and boiling, what to avoid, which local habits are worth knowing, and how to pack your water kit so it arrives intact. You will also find a table of the Peli luggage that suits each kind of trip, a short FAQ and links to related guides.
How to assess water quality in a new country
The first challenge on an exotic trip is working out which water is safe to drink. Not every tap delivers drinkable water, even when the local waterworks function well. Tap water may contain bacteria, parasites or chemical substances that cause no problem for residents, whose bodies are used to them, but can cause serious digestive trouble for visitors.
The most reliable alternative is bottled water with a factory-sealed cap and a legible label with an expiry date. In many exotic countries its production is strictly regulated, which makes it the safest default for tourists.
It also helps to know the local rules. In some countries tap water is treated and drinking it carries no risk, whereas in others it is fit only for cooking or washing dishes. When you travel somewhere with lower sanitary standards, such as India, Egypt or parts of Africa and South-East Asia, adopt a simple principle: tap water is always risky.
Your senses give a quick first check. Pay attention to three things:
- Smell: water should be neutral, without a chemical or musty note.
- Taste: drinking water should not taste metallic, salty or chemical.
- Clarity: water should be transparent, without sediment, cloudiness or floating particles.
These sensory tests do not replace a laboratory analysis, and clear water can still carry microorganisms. Treat them only as a way to spot obviously bad water quickly, never as proof that water is safe.
Safe water sources on the trip
Safe hydration is the foundation of a healthy trip. Bottled water with a factory seal is the most reliable choice in almost every country. When you buy it, check four things: the cap or screw top is intact, the label is legible, the expiry date is current and the manufacturer is credible. Buy established brands in supermarkets, kiosks and airports. Avoid water sold loose or in suspiciously cheap bottles, because in some countries counterfeits circulate, or local tap water is simply repackaged into bottles.
Water in hotels and restaurants needs caution. Make sure the staff really use factory-sealed water, ask about the source, or bring your own bottle. In shops, read labels, expiry dates and caps, because bottled tap water is sometimes sold under a local brand.
When nothing else is available, boiling is an excellent solution. Boil the water for at least 3 to 5 minutes, longer at altitude. Boiling destroys most bacteria, viruses and parasites that cause digestive problems, so boiled water is safe for drinking and for preparing meals. Remember, however, that it does not remove chemicals, heavy metals or an unpleasant mineral taste, so treat it as a temporary or emergency solution.
If you travel actively or visit regions with limited access to drinking water, portable travel filters are worth the space in your pack. The most popular types are:
- Portable UV sterilisers destroy bacteria, viruses and parasites within a few dozen seconds. They are light and convenient for a backpack.
- Gravity filters are large bags or filtering jugs, ideal for camps and trekking. Water flows through a filtering cartridge that removes microorganisms.
- Pump filters work like a hand pump, pushing water through a cartridge that removes bacteria, cysts and most contaminants. They are excellent in mountain regions and near rivers.
Maintenance matters as much as the filter itself. Rinse the cartridge regularly and replace it according to the manufacturer's instructions, otherwise effectiveness drops. Some filters also improve the taste of water, which makes it easier to drink enough on a hot day.
Store water in clean bottles, do not wash fruit under doubtful tap water, and in hot regions drink small amounts regularly, because dehydration raises the risk of stomach problems.
Cabin cases for your water kit
A filter, tablets and electrolyte sachets are only useful if they arrive intact. A protective cabin case keeps them with you, dry and undamaged.
Peli Air 1535 Carry-On Case
Peli Air 1535 Carry-On Case is rated IP67 (submersible to one metre for 30 minutes) and MIL-SPEC tested. Its HPX² polymer shell is up to 40% lighter than traditional hard-case materials, and an automatic pressure equalization valve balances the air pressure during flight. It comes with no foam, with foam, with padded dividers or with a TrekPak divider system, which makes it a good home for filters and bottles that must stay sealed from moisture.
Peli Air 1535 TRVL Black Cabin Suitcase
Peli Air 1535 TRVL measures 55.8 × 35.5 × 22.8 cm and weighs 4.7 kg. It is crushproof, waterproof and dustproof, has spinner wheels and two integrated TSA-approved combination locks, so inspectors can open it without cutting anything. The same model is also available as a blue cabin suitcase and a burgundy compact travel case.
Peli ATX HC22 Carry-On Hard Case
Peli ATX HC22 measures 55.9 × 35.6 × 23.1 cm outside, holds 30 L and weighs 4.8 kg empty (5.9 kg with liner). It uses a sealed hard-sided shell with TSA locking latches and no zip, and a removable liner separates clothing, electronics and your water kit. It is also available as a beige carry-on suitcase.
Water treatment products
You cannot always rely on bottled or boiled water alone, so it is worth carrying treatment products. With them you can make use of local sources, streams or even tap water in a hotel of dubious quality. The main methods are tablets, portable filters, chemical agents and boiling.
Water disinfection tablets
Tablets are among the simplest and lightest ways to protect yourself against bacteria and parasites. The most common contain iodine, chlorine or active oxygen. They destroy microorganisms in the water and significantly reduce the risk of digestive problems.
How to use tablets:
- The water should be transparent. If it is cloudy, filter it through a clean cloth before adding the tablet.
- Follow the manufacturer's instructions, because the action time depends on the temperature and quality of the water.
- After adding the tablet, wait the indicated time before drinking, usually 30 minutes to an hour.
- Never exceed the recommended dose. An excess of iodine or chlorine causes an unpleasant taste and side effects.
Portable filters and filtering jugs
Filters suit active people in regions where drinking water is hard to find. They remove bacteria, cysts and most parasites. Pump filters treat river and lake water quickly but need manual work, gravity filters suit camps but can take several hours, and jugs are convenient in hotels but do not always eliminate viruses. Clean and replace cartridges as the manufacturer instructs.
Boiling the water
Boiling is one of the oldest and most reliable methods. Water boiled for at least 3 to 5 minutes loses most bacteria, viruses and parasites. In the mountains or at high altitude, extend the boiling time, because water boils at a lower temperature and microorganisms can survive a short boil.
Boiled water is suitable for drinking, preparing meals and washing fruit or vegetables. It does not remove chemicals or heavy metals, so if you suspect chemical contamination, use tablets or filters instead.
Disinfecting drops work like tablets and change the taste less. A combination of methods gives the best result: filter first, then add tablets or drops.
Where to avoid drinking water
Even water that looks clean may contain bacteria, viruses or parasites. Here are the places and situations worth skipping.
Tap water in exotic countries
In many exotic countries tap water is not fit for drinking. This concerns India, Egypt, Mexico and many countries of Africa and South-East Asia, among others. Local residents may drink it without problems, but a tourist's body can react with strong diarrhoea, dehydration and abdominal pain. In such regions use only bottled or boiled water.
Ice, fountains, rivers and streams
Ice can be as risky as tap water, because in some places it is made from untreated local water. Ask whether it was made from bottled water, and skip it if you are not sure. Fountains, rivers, streams and lakes look inviting on a trek, but may carry bacteria, parasites and viruses, so boil, filter or treat that water first.
A "local bottle" of unknown origin
Water sold in local bottles may have been filled from the tap. Buy from reputable manufacturers and check the factory seal and the expiry date every time.
To sum up, the safest sources on a trip are factory-sealed bottled water, boiled water and properly filtered water. Be cautious with everything else, and the trip stays comfortable and healthy.
Curiosities and local practices
Travel is also about adapting to local habits. What is completely safe for residents may be a real threat to visitors, so knowing local practices helps you avoid health problems and prepare for drinking water in each region.
Egypt: alcohol as a "protective agent"
A popular myth among travellers says that a little alcohol protects against the "pharaoh's revenge". Medically it does not, because alcohol does not remove viruses or most water parasites. Safe hydration in Egypt means bottled, boiled or filtered water, and no ice or tap water.
India: "bottled tap water"
In India you may come across so-called "bottled tap water" that is not always safe. Choose reputable brands from larger supermarkets, check the factory seal, the label and the expiry date, and avoid water sold loose or in street kiosks. Many travellers combine a travel filter with disinfection tablets.
South America, Africa, South-East Asia
Access to drinking water varies widely in these regions. In large cities bottled water from reputable manufacturers is easy to find, but in smaller towns and tropical areas access may be limited. Always carry treatment products: a travel filter, tablets or chemical disinfectants. Avoid water from public fountains, rivers and streams, and avoid ice made from local water, because these are frequent routes of infection. Regional differences matter too. In a city the tap water may be fine, while in villages or on a jungle trek you should drink only boiled or filtered water.
Check-in luggage for longer trips
On a long trip, bulkier items such as jugs, spare cartridges and electrolyte supplies can travel in checked baggage.
Peli ATX HC25 Blue Check-In Suitcase
Peli ATX HC25 measures 66 × 45.7 × 26.9 cm, holds 70 L and weighs 8.39 kg empty. It has a sealed shell with TSA-recognised locking latches, four Hinomoto spinner wheels and a removable compression-strap liner.
Peli ATX HC30 Check-In Hard Case Suitcase
Peli ATX HC30 is the full-size option: 76.2 × 50.8 × 30.7 cm, 90 L and 9.93 kg empty. Its sealed polypropylene shell protects against water and dust, and a removable liner with compression elements keeps contents from shifting. A blue version is also available.
Peli Aegis HY32 and PX25
Peli Aegis HY32 is a 115 L hybrid rolling duffel (500D Cordura, 40.6 × 38.1 × 76.2 cm, 4.76 kg) for clothing and non-fragile gear. Peli Aegis PX25 is a 25 L backpack with an EVA front panel and a padded laptop compartment, handy as a day pack for a bottle, a UV steriliser and tablets.
Which Peli model for which trip
| Model | Size and weight | Best for |
|---|---|---|
| Peli Air 1535 | IP67, HPX² shell up to 40% lighter | Filters and electronics that must stay dry in the cabin |
| Peli Air 1535 TRVL | 55.8 × 35.5 × 22.8 cm, 4.7 kg | Short trips with a full water kit in the cabin |
| Peli ATX HC22 | 55.9 × 35.6 × 23.1 cm, 4.8 kg, 30 L | 3 to 5 days, cabin only |
| Peli ATX HC25 | 66 × 45.7 × 26.9 cm, 8.39 kg, 70 L | A week away, checked baggage |
| Peli ATX HC30 | 76.2 × 50.8 × 30.7 cm, 9.93 kg, 90 L | Two-week expeditions, filters and spares |
| Peli Aegis HY32 | 40.6 × 38.1 × 76.2 cm, 4.76 kg, 115 L | Heavy packing of non-fragile gear |
| Peli Aegis PX25 | 25 L backpack | Day trips, bottle and tablets within reach |
Additional precautions
Safe water is not only the choice of a source. It is also caution in everyday situations. Even where bottled water is widely available, poor hygiene or carelessness when eating and drinking can lead to digestive problems.
Hands, produce and drinks
Wash your hands regularly, especially before eating, using bottled or boiled water when the tap may be contaminated. Alcohol-based disinfectants are a good alternative. Wash fruit and vegetables only in safe water, or peel them yourself. Order cocktails without ice.
How to react at the first symptoms of diarrhoea or dehydration
- Drink small amounts of boiled, filtered or bottled water regularly.
- Replenish electrolytes with isotonic drinks or ready-made electrolyte mixtures.
- Eat lightly and avoid heavy meals.
- If the diarrhoea is intense, fever appears, there is blood in the stool or dehydration worsens, see a local doctor as soon as possible.
Packing the water kit
The essentials are a travel filter or flask with a filter, disinfection tablets and, for longer expeditions, a portable UV steriliser. Tablets and a flask are mandatory because they protect in every region and weigh little. A gravity or pump filter and a UV steriliser are optional extras for trekking or regions with little bottled water. Add small bags or bottles for filtered water and an electrolyte set.
- Carry-on baggage: tablets and a portable UV steriliser can go in the cabin, in a separate, tight container.
- Checked baggage: larger filters, filtering jugs and flasks with a filter can go in the hold. Take out a replaceable cartridge and secure it separately.
- Easy access: keep at least tablets and a filter flask within reach.
Airline rules for liquids, batteries and equipment change, so check your airline's current rules before you fly. For more on the hold, read What Can You Pack in Checked Baggage?
Frequently asked questions
Is bottled water always safe?
It is the safest default, but only if the seal is intact, the label is legible and the expiry date is current. Be careful with loose water and suspiciously cheap bottles.
Is a filter enough, or do I also need tablets?
A filter removes bacteria, cysts and most parasites, but jugs do not always eliminate viruses. Combining a filter with tablets or drops, or boiling, gives the widest protection.
When should I see a doctor?
If diarrhoea is intense, you have a fever, there is blood in the stool or dehydration gets worse, see a doctor or medical point as soon as you can.
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Summary and the most important rules
Choose factory-sealed bottled, boiled or properly filtered water. Check labels and expiry dates, avoid ice unless you know where it came from, wash hands and produce with safe water, and keep tablets, a filter or a UV steriliser within reach. Do not trust myths about alcohol or "bottled tap water", react quickly to the first symptoms, and plan an alternative water source for every region. A few simple rules are the key to comfortable and safe travel around exotic countries.
