Sep 22, And not only does it feel satisfying, drinking water is vital for our bodies to function. But exactly how much should we be drinking?. Find out how much water you should drink per day based on your individual needs and level of activity. Hydration tips and suggestions on how to drink more. Jun 20, There are many different opinions on how much water you should be drinking every day. Health authorities commonly recommend eight 8-ounce glasses, which equals about 2 liters, or half a gallon. The researchers estimated that drinking 68 ounces (2 liters) in one day increased energy.