glitch25

http://www.re-nest.com/re-nest/conservation/how-to-save-46-gallons-of-water-a-day-without-even-trying-reader-submission-129134

Can't get much more simple than that. And I think I have a hide-able bucket that will work nicely, although in my case, not so much about the shower (ours is piped less that 24 inches from the water heater so hot is almost instant) and more about the water while waiting for the kitchen tap to heat up while doing dishes.