A better analogy though, is that your water company owns or controls the pipes and taps in your house. They offer "limited use" of water for a particular fee/rate, and at an addtional fee/rate they will install/open a tap in the kitchen for cooking and drinking.
Even then, to keep the analogy tight, "limited use" would have to be confined to uses where it would be impractical for you to collect the water for other uses, i.e. in a closed system like a sealed toliet or dishwasher.
So you could move to a water district that let you own/control your own pipes, but, all other factors being equivalent, basic economics will dictate that your "all use" fee/rate will be similar the combined cost of "limited use" + "Tasting".
In the end, the answer is always "Whatever the market will bear". And people love their water almost as much as their internet. At least Slashdot users would be willing to give up their "bathing" water for it.