If you've ever wondered what the financial or ecological costs of a bottle of water really are, then check out this great infographic detailing the facts of bottled water. Some of the things are really interesting, like the fact that 40% of all bottled water companies just get their water from tap water.
Of course people do the same thing with cans, glass bottles, etc. Humans are just nasty, selfish creatures.
It's fine to sneer at the trendy buffoons who turn up their noses at different brands of bottled water that are all really tap water, but when you get up a 6am and try to make coffee of tea from something that smells like an old turpentine bucket you have a different view of the subject...