If you're having serious problems with water shortage, consider placing piss pots in every bedroom--the kind with lids and that rich people used in olden times because they were too lazy to walk down hallways in the middle of the night. Their contents can be poured down the laundry area drain the next morning. Pour soap water into the drain after. This will actually prevent your toilets from stinking.

There still are piss pots made of sartin being sold in marketplaces, and, of course, there are those fancy, red, wedding-gift piss pots painted with flowers being sold in Lucky Chinatown.