Drink more water?

According to one article, Michelle Obama has come out with a new campaign to solve our nation's health problems: 

I’ve come to realize that if we were going to take just one step to make ourselves and our families healthier, probably the single best thing we could do is to simply drink more water,” Obama said in a press release. “That’s it – it’s really that simple. Drink just one more glass of water a day and you can make a real difference for your health, your energy, and the way you feel.

This really stains credibility.  The "single best thing" to make yourself healthier is definitely NOT drinking more water.  There is no good scientific evidence that drinking more water has any effect at all on health.