Dr. Youngquist: So you could probably at least double that when you're exercising. People tend to, instead of maintaining that fluid status, tend to get behind and catch up with a lot of water, and then get behind and catch up. So we don't consume that evenly throughout the course of the day, and it's probably impossible to do so. But that's why we have kidneys. Kidneys are good about conserving water when we need it and getting rid of it when we've got excess.