I drink filtered tap water.

Bottled water comes from municipal sources in the first place (it is tap water put in a bottle), so I don't see the point in paying extra for it.

Put a filter on your tap and drink away. You aren't taking any more risk with that than with bottled. Also earlier this year there was a report on different brands of bottled water. Some brands didn't even pass the standard for normal tap water. I prefer knowing that I am using a good series of filters on my water instead of trusting some company to do it.