There are cheaper solutions than japanese toilet, bidet or handhelds - using a bottle of water, you just need a good capacity, and need to refill before or after the deed. Aim at your anus and stretch your asscheeks with your other hand and do circle and robbing on your skin while emptying the water with the hand holding the bottle. It is a bit technical the first time, a bit disgusting but fecal mater is 100% washable so your hands and anus will be all clean and your anus will thank you for the rest of the day. But you need enough capacity for the water. You can also use soap and do two round while emptying each halves of the bottle. First round remove all fecal, then soap (use a gentle soap!) then empty the remaining of the bottle. You don’t really need soap though because the results with water only is already infinitely better than with toilet paper. You can use the toilet paper to dry your skin or use a small toilet exclusively allocated for this usage - if you are home take a brief cat shower and aim exclusively the anus. A bit more cumbersome because you need to remove your clothes and shoes if you wear them