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Here's an example of how water brands vary:

http://www.ehow.com/facts_6961715_bottled-water-brands-compa...

It is idiotic to believe all water is equivalent. Indeed, a lot of the marketing around brands is ridiculous but it's not quite the same thing.

I can't remember the name of that portuguese brand of water, 10 years ago, maybe some HNers would know. You would buy it on a hot day on the street, believing it was ice-cold... while its bottle was in fact made of a curious, deceiving translucent material and the liquid not especially cool.