This is what our son uses: https://gizmodo.com/amxd-puts-fighter-pilots-piddle-packs-out-of-business-392643
My wife stayed on the truck with me for 6 months. She has a shirt that she named the 'peeing outside' shirt. It comes down to her knees, so it's long enough to cover things when she takes a squat in the grass. Most times we laid over in a civilized spot with facilities, but it sure came in handy a few times.
All I know is the new word censor is Fan-tassss-tic. I passed up this thread many times because I was embarrassed to see what it was all about. Thankfully it wasn't about Cassens, you know, the car hauling company? I assumed this would be a good thread and I was not disappointed. Read at you discretion... some assembly required.