So how much water do you need to drink? Well, I know you’ve heard at least eight 8-ounce glasses a day—but do you really get that? Try not to include any other kind of liquid. Juices, coffees, teas, sodas, and beer do not count. These drinks max contain sugar, chemicals, caffeine, and alcohol, and some of them dehydrate you. Did you know that a good portion of the population is living in a state of partial dehydration?