If you're not ready to go completely without running water (hat tip to Øyvind Holmstad), here's a suggestion: try living without running water for 5 days a week. It doesn't have to be in a row; you can go 2 or 3 days without, one day with. This challenge is inspired in part by the water crisis in Sao Paulo and partly by the second time my pipes burst last winter. I decided rather than repairing it right away and risking them freezing a third time, I decided to wait a couple weeks until the weather got warmer. In the meantime I would turn on the water every couple days to wash up and store up water for the off days.