Not even close. Boiling only destroys microorganisms, which are rigorously tested for and removed in public water supplies in the US. After an earthquake or other disaster where there may be some busted pipes or other potential sources of contamination that may happen between the processing plant and the home of the consumer, the local water authority usually recommends boiling as a precaution, and I would do the same.
Bottled water, in the US, is generally purchased for:
- Convenience - As with Soda/Coke products, it is actually cheaper to buy a 2liter bottle than it is a 591mL bottle, due to convenience alone.
- Taste - US public water has different amounts of dissolved solids (minerals), which must be at acceptable levels at all times. These solids are what cause taste variance between regions/water sources. Also, public water is fluoridated, mostly to mess with conspiracy theorists.
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- Status - As China is currently finding out, the only thing a population with new money likes more than more money, is the ability to show off to the world how much money they have. It doesn't just stop at cars, homes, and jewelry. Once you self-identify in a certain social/economic circle, you will instinctually make choices that are meant to further that image. Yes, even having a bottle of imported water from an Antarctic well that only produces 100litres of water per year, suddenly becomes important.