Bought a Reliance Products Aqua-Tainer 7 Gallon Rigid Water Container that I fill with water from our house that is used for coffee, drinking and ice. Our trips are usually 4 nights so we don't ever use this much water. Once we dump at the dump station what is left of this water is poured into the toilet so it can slosh around in the black tank on the way home.
We use to just use campground water until we stayed at a place in SW VA. I expected good water from the mountains. Nastiest water we had ever had ANYWHERE. The ice ruined sodas. Worse than water near the ocean.