You probably heard that tourists from developed countries are banned drinking water in some developing countries, but do you know why? Water supplies in many developing countries are not treated as in developed countries; various bacteria, viruses, and parasites commonly found in water.

Many experts recommend drinking only bottled water when traveling. If using tap water, first you have to boil or clear it with iodine tablets in advance. If you are a toothbrush, wash your contact lenses, mouthwash, or add ice in drinks, first make sure the water is safe to drink.