“How much water do I need?” It’s a FAQ I get as a fitness instructor. According to health guidelines, an adequate daily fluid intake is: About 15.5 cups (125 ounces) of fluids for men About 11.5 cups (91 ounces) of fluids a day for women These recommendations cover fluids from water, other beverages and food. About 20 percent of daily fluid intake usually comes from food and the rest Continue Reading