Bottled water is a joke, one of the biggest consumer and taxpayer ripoffs ever. I applaud California A.G. Jerry Brown who said recently that he will sue to block a proposed water-bottling operation in Northern California by Nestle.
I don't promote bottled water, but the plane is a place where it actually might make sense. At the end of one long-haul flight you can easily find yourself with five one-time use plastic cups on your hands. Five!