I have been drinking the water from campgrounds faucets and the stuff that is stored in my tanks ever since I started RVing. Haven't had any problems or died yet of some horrible disease. I occasionally toss a little chlorine in it to take care of any potential bugs and then flush it through. I do have a whole-house filter that I change every 3-4 months, and in Florida, I use a secondary filter at my hose, not because I think the water is dangerous, but because it tastes so bad in a lot of places.
ABC News is reporting that Aquafina admits its water is the same as the stuff that comes out of your tap: http://abcnews.go.com/Business/aquafina ... id=3428260