Best Toilet Paper Alternatives For a Long Emergency

I know some people pride themselves on stockpiling a lot of toilet paper but no one can stockpile enough to get through a long emergency without sacrificing space and money.
Personally toilet paper is a luxury I hope to never give up.
Traditional toilet paper may, unfortunately, continue to be rarer then it has ever been in modern times.
I don’t think many used books will survive if people need them for fuel or toilet paper during SHTF.
This gal ain’t giving up her toilet paper without having to but wants to be ready with other options just in case.