A quick peek at Consumers Reports Online revealed this tidbit:

"Bottled water, often advertised as a "pure" and "natural" alternative to tap water, is generally safe. But it's actually less regulated by the Environmental Protection Agency than municipal water supplies. Indeed, some bottled water is simply filtered tap water."

I believe they ran a double blind water tasting trial a few years ago, and Los Angeles tap water was the winner, preferred over all the bottled waters that were tested.

Taste in water leaves me puzzled - the primary sensation for me on drinking water is wetness and liquidity, the result of a long time in desert environments, and it helps that my taste buds were shot off in the war.