You can buy water purification tablets to purify your water source. You can also get free tap water, then use the medicine and drink the water, which is a good way to save money. However, bottled water or boiled water is available in every lodge/teahouse, and the cost of bottled water ranges from 100.00 to 350.00 NPR, and it is advisable to drink about 4-6 litres of water per day.