I make a gallon of Crystal Light everyday. I sometimes bring a 20 oz. bottle of water to school with me, and I’ll have several sodas when I’m at work. So I guess I drink about 1.5 gallons a day. And on the weekends, 2 gallons.
Usually between 48 and 70 oz of water, juice or milk (that’s oz all together, not of each) a day, though I’ve been drinking soda a work this week since there’s no juice. For example, today I drank 2 12 oz sodas, period, and I’ve been awake 12 hours so far. But I haven’t eaten dinner yet, so it’ll be more by the time I go to bed. And you thought I was kidding in the " Does Anyone Else Dislike Drinking" thread 
http://boards.straightdope.com/sdmb/showthread.php?t=241252