Water available in taps, streams or river water is totally detrimental and unfit for drinking purpose. Sadly, large fractions of the Nepalese population, both in rural and urban areas, are deprived of safe and adequate drinking water. We recommend our travelers to drink boiled water or purified water by adding purification agents. Although we discourage the use of bottled mineral water, but if you have to use it then double check that the seal is intact and the top of the bottle has not been manhandled. Overall, it is very important to drink adequate quantity of water when you are trekking in Nepal to avoid any threats associated with dehydration and altitude sickness.