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Do you have a basement under the shower or near it? you can get large square plastic water tanks that fit on a pallet, build it up a bit so the over flow is gravity fed back in to the drain, over flow should also be based off the bottom of the tank so it cleans the sediment out first then use an RV style pump to build line pressure up going to the toilet, pex tubing is really easy to use to run supply lines, if you are doing this you might also want to look in to a drain heat exchanger that will preheat your cold water coming in to your shower with the heat from the drain water (warmer cold water mean you use less hot water and it's direct use of the heated water), you might also want to look at what else you have in your house, water softeners dump waste water, reverse osmosis water filters dump waste water and is it worth owning a washing machine? right now my house with three people in it we average 42 gallons per day with an old 5 gallon flush toilet and a high flow shower head that I need to switch out as soon as I find one of a quality that I like.
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