Every day you lose water through your breath, perspiration, urine and bowel movements. For your body to function properly, you must replenish its water supply.⁠

Every day you lose water through your breath, perspiration, urine and bowel movements. For your body to function properly, you must replenish its water supply.⁠

So how much fluid does the average, healthy adult living in a temperate climate need?⁠

About 15.5 cups (3.7 liters) of fluids for men⁠
About 11.5 cups (2.7 liters) 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.