We had a great water filter system on our old motorcoach but we never drank the water out of the faucet. We always carried cases of 20oz bottled water, we know the water we are drinking is good and if we need a bottle to take on a walk we had it.
I think the water at the campground (and all over WDW) has that funny kind of sulfer (sp?) taste- but that might just be because I'm not used to it. A water filter doesn't seem to take it out either. We always pay the extra money for bottle water at the parks because we don't like the taste.
LLagow