We use water directly from our faucet whether the source is a filled tank, or connection to the water supply where we are parked. We have a whole house water filter and if water sits in the tank for a period of time (a few months) we drain it, sanatize and refill. We do usually have water connections where we stay. Well water as provided by many places is probably better water than what you buy at the store, and I refuse to spend my money on water that is pumped into those bottles the same source as many taps have anyways. Research it!