We all know water is good for us and that we should probably drink more of it. So why, then, do Americans find it so difficult to sip from what is arguably the fountain of youth?

Answers vary, but the fact is, one in 10 Americans drinks zero cups of water per day, according to a study by Dr. Alyson Goodman, a medical epidemiologist for the Centers for Disease Control and Prevention. Zero. She suspects that those who don’t drink any water (or very little) are getting it from other sources such as food and coffee, but warns this may not be enough.