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For us guys, we can use a waterless urinal. Dual flush toilet valves will reduce a (now mandated) 1.6 gallon flush toilet down to about 0.9 gallon small flushes. These valves are sold for under $20 at home centers.
Many new dishwashers use ~1/3 the water of average dishwashers. Ditto for front loading clothes washing machines. Low flow shower heads can drop the flow from ~3-4 gallons per minute to ~1-1.5 gallons per minute, and some of them have temporary shutoff valves on them so you can turn them off while you are washing, and then turn it back on again when you need to rinse.
There are now gray water systems that flush your toilet with the water you have already used once in the bathroom sink.
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