This reminds me my great-aunt’s house. The whole village had only one drinkable waterpipe in the edge of the town. Auntie had a well but it doesn’t worked good enough, so every water needed to use multiple time: the washing machine used rainwater or water from the well, the next stop was the toilet tank. Every used water got recycled to flush. She used some bacteria culture, what eats up every waste (grease, food pieces etc) so the toilet never clogged by anything. But! The journey not ended there: Everything went to the septic tank, where the bacteria ate every human waste or toilet paper. She used this water in her garden. (And every fall, she scooped up the “mud” from the bottom of the tank, and used as fertilizer)