Our city water supply is safe, and we already pay to have it piped in; why would I pay again to buy bottled water at the store? That's just dumb--a waste of money--and we have no extra money to waste.
There is no need to boil water from treated, municipal water systems. It is perfectly safe and healthy.
SOME communities do have a higher mineral content in their water that makes it taste funny, even though it is still 100% safe. Those folks might benefit from some kind of filtration or water softener system, but there is still no need to waste money buying water at the store.