>>375507Use a bidet, pic related. Little squeeze bottles that you fill with clean water. Spray yourself after you poop, then use your toilet paper to dry.
You'll get cleaner than you would by toilet paper alone. And, you'll need a whole lot less toilet paper, too. Squeeze bottles aren't very heavy, and you leave them empty when not in use, so they're not a pain to carry. Don't poop in the river anymore.