“I thought most people use tissues on Shabbos. What do you use?”
You can rip up toilet paper before Shabbos. That’s what we used to do in EY back in the day when tissues were considered a luxury and a waste of money in EY. Apparently, they also used to do that in the US, because my grandfather, a”h told me that he remembers cutting up t.p. before Shabbos when he went to his grandparents for Shabbos.
In the US, the sewage system is much weaker than it is in EY, and using tissues can cause clogging, especially in NJ, and I think maybe especially in basement apartments.
However, I don’t think it’s an issue in EY.