You can or they sell 1,3 and 5 gallon containers you can buy then after that it is just the price of the water,but be sure it is RO water coming from that machine i just know for a fact that 33 cents over time is alot cheaper than 64 cents a gallon.There has been alot of threads on here about wal-mart water and distilled but if you don;t have a ro/di unit like myself there are not very many options :thinking: