Mother Jones published an article disclosing the sources of many popular brands of bottled water. As it turns out, most of the bottle water for the country comes from the drought-ridden state of California. Another image (seen below) expands the view of the State of California, showing the major companies that can be found here.
The full article can be found at http://www.motherjones.com/environment/2014/08/bottled-water-california-drought