about 64 oz. of clear liquids (think water, soda water, some fruit juices and green tea, for instance) is the fluid intake everyone should aim for. any less and you'll prolly end up dehydrated, any more and you're prolly drinking too much.
40-60 oz of water a day is fine, as long as you're not drinking many other things than that (unless it's soda or beer, then you should be drinking more water.)
I'm certainly not a doctor, but I have way too much free time on my hands, and read way too much
