I've never posted a picture before, so I hope you can see it. I am a woman in my 60s. I use a drink cooler with a wide mouth to pee. It is probably a gallon size which is necessary for the many potty breaks during the night. I put the tissue in the waste basket. I have a small flashlight ($1 from Walmart that is clipped to the side door handle at night. I keep my pee container on the first step with the lid on. (Don't want any accidents.) When I have to pee, I turn on the flashlight that is hanging down, the van is still pretty dark. I open the container and put my right foot on the step, my left knee is on the van floor. I do my business and tighten the lid. (I did use the jug for a #2 one time in an emergency situation.)
The next day, I put the gallon drink container, fully tightened, into my backpack. I then take it to the first place of the day, either a park, library, gas station or eatery. Don't take a backpack into a retail store, they may think you are stealing merchandise. BTW, if I am in a forest or nature, I won't use the shampoo, and I will disperse the pee with a wide swinging motion unto the ground.
I dump the container in the toilet. I then use my collapsible cup to put water in the jug and rinse. I then put about 1/2 cup of water and a squirt of $1 (dollar store) shampoo in the container. I leave the jug in the stall while I get water from the sink. I don't want anyone to come into the restroom or see me doing the nasty. I may use the "potty" during the day but I usually want to start the night with an empty container.
I also added a small bag with a toothbrush and toothpaste. I might as well brush my teeth after taking care of business.