While the eight glasses rule is a good start, it isn’t based on solid, well-researched information. Your body weight is made up of 60 percent water. Every system in your body needs water to function. Your recommended intake is based on factors including your sex, age, activity level, and others, such as if you’re pregnant or breastfeeding.

Adults

The current IOM recommendation for people ages 19 and older is around 3.7 liters for men and 2.7 liters for women. This is your overall fluid intake per day, including anything you eat or drink containing water in it, like fruits or vegetables.

Of this total, men should drink around 13 cups from beverages. For women, it’s 9 cups.

For more information:  https://www.healthline.com/health/how-much-water-should-I-drink#recommendations