Luckily, like most Americans, my water is fine to drink. It's pulled from 2 miles out in Lake Michigan and does fine. Plus, my fridge filters and cools it, and that's where I get my water from. Sure, I'll buy a bottle every now and then just to get the bottle... which I subsequently use over and over by refilling it from tap.
However, if you want to see what will really drive some wars/disputes in some areas in the future, look to water. As indicated by some in this thread, you can't get good water everywhere. It is scarce and depleting -- in the face of increasing population.
Problems with water supplies have begun in the third world and are migrating. In the future it will be a big issue, and I expect bottled water prices will outpace gasoline prices for some time to come.
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