How many liters of water a person should drink in a day will vary according to factors such as age, sex, and activity levels.
According to the Academy of Nutrition and Dietetics, the average recommended daily intake of water from both food and drink is:
• 11.5 cups per day for women
• 15.5. cups per day for men
• 5-11 cups for children, depending on their age
This equates to 2.7 liters for women, 3.6 liters for men, and a minimum of 1 liter for children.