Make self-care a priority! Join "GMA" and Dr. Jennifer Ashton with a new self-care challenge every month.

Thirsty for self-care tips? This hydration challenge will do the trick!

Micahel Strahan, Sara Haines and Keke Palmer found that their skin, sleep and energy improved after drinking more water for a month.

The hosts took it upon themselves to drink more water in the name of self-love, all thanks to Dr. Jen Ashton and her new book, "The Self-Care Solution: A Year of Becoming Happier, Healthier, and Fitter--One Month at a Time."

"Think you drink enough? You probably don't," Ashton says in her book.

On average, children and adolescents in the United States drink about 15 ounces of water and adults drink an average of 39 ounces of water on a given day, according to the Centers for Disease Control and Prevention.

Ashton was inspired to do her own hydration challenge after she learned she has had three kidney stones, which were caused by dehydration.

"I have a really busy day, every day ... and I'm embarrassed to admit that I felt that if I drank water, it would slow me down because I have to use the bathroom a lot," she told "GMA."

"When I began taking stock of how to improve my health this year, drinking more water was an easy choice for a challenge," she said in her book.

The challenge

For 30 days, Strahan had to drink 125 ounces of water each day, while Haines and Palmer had to drink 90 ounces of water each day.

The recommendation for the amounts came from the Institute of Medicine, which advises women to consume approximately 2.7 liters of water from beverages and food, and suggests 3.7 liters each day for men.

So, how confident did the trio feel going into this challenge?

"When you're trying to hit a certain level, you absolutely have no time to drink anything other than water," Haines said.