It is better if you can manage your water source. To filter your water source, you can buy water purification tablets in Kathmandu before you head on your journey. You can also save money by getting free tap water, then using the water purification tablets and drinking the water. Bottled water or boiled water is accessible in every lodge/teahouse, and the cost of bottled water ranges from 100.00 to 250.00 NPR. It is recommended that you drink 4-6 litres of water each day to avoid dehydration!