The amount of water needed per day varies by factors like gender, activity level, climate, and health. Generally:
- Men need about 125 ounces (15.5 cups or 3.7 liters) of fluids daily.
- Women need about 91 ounces (11.5 cups or 2.7 liters) of fluids daily.
These amounts include fluids from all drinks and food, with about 20% of daily water usually coming from food. Adjustments are needed for exercise, hot weather, pregnancy, and illness. The old advice of "eight 8-ounce glasses a day" (64 ounces) is a simple guideline but not precise for everyone. Listening to thirst and individual needs is important.
