Mark-up: Up to 4,000 percent
Last year, this was second on our list of the 10 most overpriced products to avoid, with a 4,000 percent markup. As Jennifer Taggart, who blogs about reducing toxic chemical exposure, points out, most municipalities have good tap water that cost pennies. And other than buying in bulk at a big-box store or buying generic, there aren't many ways to save on bottled water, except for maybe just bottling your own from the tap.
(AP Photo/Paul Sakuma)