 At least two liters a day, at least, I believe that is an accurate statement with RDA or FDA, whichever, eight-ounce glasses, 64 ounces. If you can do at least that, you're in good shape. If you can drink more than that, you're in better shape. I recommend doing it first thing in the morning and just a little bit of flavoring, and then it becomes a habit like coffee is. Right. It all works. It all builds up. I've been criticized because I'll drink a lot of water at once,