We purchased a water cooler/heater. It is the type that uses a 3 or 5 gallon bottle sitting upright in the bottom of the unit. You can purchase water for $1.00 for 5 gallons. It works great. you always have hot and cold purified water at hand. We carry one spare bottle which gives us about 4 days to find a source to refill when needed.
We also have one of those under sink filters just to take the edge off the tap water if we run into some bad water.
Be Of Good Cheer!!!