there are no recommendations of fluid by weight. it is generally accepted that drinking to thirst should be adequate unless you have certain medical conditions participate in intense or prolonged exercise or live in hot climates. the institute of medicine does have general fluid guidelines -- 11 or more cups per day for women and 15 or more for men. this includes fluid from food and beverages (even caffeinated drinks like coffee). see this article for more information.
what is ideal level of hydration? is there a formula regarding height and weight?