I have been using tap water for years with no trouble.
Is there a particular problem with your water? If not, simply adding 1/2 a crushed campden tablet will get rid of the chlorine and you are good to go.
Water companies don't actually add calcium to the water. It, along with other minerals, occurs naturally. Are you boiling your water to precipitate calcium carbonate in order to change your water profile for all grain brewing? If so, you can use CRS[/url:2weime0c] to reduce it.