you take a bucket, a section of pool noodle, a trash bag DIY Homemade Porta Potty. make your own potty bucket liner with trashbag, slip the slit pool noodle over the edge for a toilet seat and attach a roll of TP to the metal handle.
Here is an example of using a toilet multiple times. She lines it with newspaper between every use and sprinkles A&H Deodorizer on it. This toilet seat has a rubber gasket so it never leaks odor. Use kitty litter.
I would also put a second protective bag over the cushioned pool noodle toilet seat to catch splatters (yuck.) An easy, DIY, camping / emergency preparedness toilet that's also good for those long-distance vacation road trips!
This innovative, environmentally friendly Cleanwaste PETT portable environmental toilet has full-size features but folds to an easy-to-carry briefcase size for travel. Available at REI, Satisfaction Guaranteed.