I think this is a very interesting topic too. I wonder if there is a difference in people who have a well and people who have city water.
As far as the idea of using water bought from a store for pwc
's I think the idea is a good one. The water is coming from a different area and the sources of that water are usually just for the commercial use by that company. But in practicality I don't think that using store bought water makes a significant difference in the amount of water usage. But very but counts I guess