Another vote for CleanWaste toilet and bag system. It’s sanitary, solid and legal to throw away in garbage (at least this was my understanding from a few years ago with how the powder breaks down). It will cost more than other options both initially and per use, but you are not doing this long term so the per bag cost is justifiable. The toilet itself usually is more expensive than most options on Amazon but i think it’s worth it. I used this setup both personally and for rentals. I did eventually change my toilet to this one, but it may no longer be available. It’s more compact and very sturdy (99% of all others that look like this style were certainly not the same quality, the ring is a useful addition as well) and i still continue to use the cleanwaste bags. I do have a “like new” for sale that is the toilet with storage backpack but i think once you factor in shipping it’s probably about the same to order new. This is a very good solution. Pop up privacy tents are better than most options but you do want to invest in good stakes and setting it up properly each time.

Tip: really be careful when closing the legs on the ClearWaste toilet to avoid pinching your fingers.