How does Randy decide to fix their water problem?

Randy goes to the river for water.

Randy said, "For now, Ben Franklin and I will drive down to the dock and fill up what washtubs and buckets we have out of the river. You can't drink river water without boiling it but it'll be okay for the toilets. And from now on Peyton-all of us--can't afford to be so fastidious. We'll flush the toilets only twice a day. Then I guess we'll have to dig latrines out in the grove because I can't haul water from the river forever. Matter of gasoline."