I read a health article somewhere where someone said 8-10: 8oz glasses was too much because it floods your kidneys and dilutes your electrolytes.
"The body has a built-in way of controlling hydration and telling us how much we should drink. It’s called thirst.
An extensive review, published recently in the American Journal of Physiology, could not find medical evidence to support a need for those eight glasses a day. Drinking large amounts of water will not curb your hunger, “flush” away toxins or make your skin look moist and dewy. (Your skin will look dry if you become medically dehydrated, but no one is telling you to stop fluid intake. You will become thirsty long before you become dehydrated.) "
"And if you imbibe faster than your kidneys can process, you risk dilution of electrolytes and water intoxication, causing confusion and coma."