Many of us have heard that eight glasses of water a day will do the body good, but new research questions whether we really need to drink that much.
Doctors at the University of Pennsylvania said there's little proof that water will help with things like clearing out toxins in the body, or improving skin tone and filling your stomach when dieting.
"It's required for life, and I guess that's led people to think if a normal amount is good, then extra might be better," said Dr. Stanley Goldfarb.
Experts do recommend anywhere from 11-15 glasses glasses of fluid a day, but you can get that from other drinks like coffee, milk or even soda.
Doctors say 20 percent of the water we need actually comes from moisture in food.
The best advice is to drink when you're thirsty.