RO water can be purchased at just about any grocery store, wallmart ext. but if your going to be geting alot often I would get a
Ro system and save alot of money over time
I got them at a local water store, you can get Four gallon bottles at wally world.
Then you save the caps and refill them at the water vending machines, here its like $1.50 to fill a 5 gallon with r/o or $2.50 for distilled.