This is very extreme, so it might not work for everyone. We didn't do this to save water, but instead because the cold water would not come out of the bathroom tub faucet for some reason. The hot water did, though. So, we would fill up half of a 5 gal bucket of cold water in the kitchen sink, carry it to the shower and fill it up the rest of the way with the hot water. We then used a big plastic mixing bowl with a handle to pour it over our heads.
I know I could get through a shower for less than 5 gallons, including shampoo, conditioner, and body washing. Shaving my legs took a little more, but if your water got down to the 1/4 of the bucket or so, you could put a little more hot in there and get you by.
I know, very extreme. And once we got the cold water line fixed, we didn't do that any more. But, that would save on water.
I agree about the rain barrels. I've never tried a brick, but I have filled some 1 liter pop bottles with water, put the cap on, and put that in the tank to displace water.
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