Thats crazy. I had no idea CO had such water issues.
I would think there is a cheaper way than the one gallons from Walmart. I fill up my 5 gallon jug at the grocery store for my water cooler (instead of a delivery service) for $1.25. I love my tub, but I have to say there is no way I would be hauling in 450 gallon containers or even 90 of the 5 galloners to do it.