After watching Blue Gold: World Water Wars, I'm more and more focused on eliminating bottled water. We are no longer going to buy bottles for our Movie Nights and have reusable glasses that we keep in our cars (and glass straws!)
The Story of Water (by The Story of Stuff group) is a great synopsis of why bottled water is so bad for us, the environment, others and our wallets too!
It's easy reuse a cup and carry a bottle with you or find a water fountain.
Try it for a month and see how easy it is.