I use cloth toilet paper.
This is the post my husband has been dreading. He is so embarrassed that cloth toilet paper exists in my house, let alone that I use it!
When I asked last year for all of his old, holey T-shirts that he's had since college days, he just figured that I needed more cleaning rags. Hehehe, if he only knew. Nope, I cut them into 8x8in squares. I got about 13 per T-shirt, including the sleeves. I have over 100 squares now... well probably less thanks to over-zealous toddlers.
I know somewhere I could find how much of a tree is wasted by one roll of toilet paper, but I'll spare you the details. It's not just the tree, but the resources to produce it and ship it to the store.
My daughter and I use it for pee. For #2, we usually still resort to regular TP and finish up with one damp cloth TP square. So much cleaner and softer. I also will grab one to wipe off the toilet seat or a spill on the bathroom floor or in place of a washcloth if I'm desperate.
I usually wash them with the cloth diapers. Because I only wash with cold water, I wash them 2x. First time is just with baking soda. Second time is with a tiny bit of detergent and a white vinegar rinse. They come out squeaky clean.
End of embarrassing post.