i dont know where you are, but here in Houston there are water stations, usually in parking lots of supermarkets, etc. they have great RO water ($1.50/5 gal). your LFS may sell just RO water ($.50-$.75/gal), i got razzed by some members on here for buying "used" saltwater from the LFS here ($1.25/gal). sometimes supermarkets have water stations by the front door, or even inside the store. i'm in the market for a RO/DI filter myself now, tired of hauling water. Good Luck!