While I realize it’s important to stay hydrated, the “8 glasses a day” rule is not based on good science, especially since the “glass” is not a uniform measure. Despite what the Mayo clinic and other studies have suggested, 3 liters of water a day for a man is A LOT of water, and it’s probably excessive. In fact, there is such a thing as water intoxication or water poisoning. It’s called “dilutional hyponatremia” and it can cause brain damage, or even death. It happens when you drink more water than your body can process. It’s rare, but it happens. “Pushing fluids” is not always a great idea. Anyway, except when exercising or when sweating because of warm temperatures, drinking 6 to 10 ounces of water when you feel thirsty is probably more than sufficient to remain hydrated.