I have looked around a bit, Wikipedia has an article on space toilets and one on toilet paper, but the two don't seem to be used together. According to one reference, annual consumption of toilet tissue in North America is 23.0 kg per capita. Recycling air and fluids, even solids in a farm, are all pretty well accepted concepts, but what about toilet paper?
How do you meet this essential need in space? How could you meet it on a long journey or colonization?