My tap water (Omaha, NE) is ok for most things including drinking, although in the spring the chlorine content goes way up. For drinking, my wife likes the pur filter in the fridge, but I use a special hot filtration process to improve the flavor.

For making beer, I will typically use RO water purchased from the grocery in 5 gallon refillable jugs and build back the mineral profile I want for the particular beer style I'm brewing that day.