The main one is diet. Eat enough fiber so it's not a mess in the first place. This has many other benefits too. The next in priority is wet wipes. I strongly prefer them, and they are portable unlike a bidet. They are super useful while away from the toilet as well. After that there's technique. I am confident that the people who complain about paper and wet wipes are simply wiping way too hard causing chafing or even fissures. I don't want to get too graphic, but you also need to "relax" a bit down there for the most thorough job instead of just a surface level wipe. Normal paper first for removal of the "bulk material" and wet wipes for the residue.
That's it folks! If you do all this right, washing your hands afterwards shouldn't need so much effort either.
Bonus tip: why not just carry a little atomizer bottle filled with water so you can make your own wet wipes in a pinch? The spray is gentle enough to not completely saturate and ruin even the thinnest and cheapest toilet paper you find in the wild, and such a spray bottle is again very useful away from the toilet.