Humans are mostly water, so more water couldn't hurt, right? It's like putting more chocolate chips in a chocolate chip cookie. More is better.
Tell that to the girl who died because her friends made her drink like a gallon of water to get her to come down off a bad high. Humans have a delicate electrolyte balance in their bodies, and too much water upsets that.
I'm sorry for not clarifying that my previous post was dripping with sarcasm.