In Thailand, tap water is not drinkable. Therefore, domestic drinking water has to be purchased from another source. In most urban neighborhoods in Chiang Mai, we have found these Water King vending machines that charge 50satang/liter, or about 1.5¢/liter. We use about 2 liters/day, so we go down with our 5 liter jug and 2 baht every other morning to fill up!!