I hate to get into the whole "how to poop in a bucket" thing again, but ...
Put a gamma lid on a bucket. Unscrew the lid and put the lid aside. Put a trash bag in the bucket. Wrap the trash bag over the top of the bucket so you are sitting on the trash bag, on top of the bucket. Make your deposit. Try to pee in a bottle, not in the bucket, if your anatomy so allows. Add a few handfuls of one of the following: sawdust, cat litter, coco coir, cedar shavings. Close up the trash bag. Either dispose of the trash bag in a trash dumpster immediately, or reuse it a number of times before disposing. Dump your pee bottle somewhere where people will not walk on it. Some prefer to double bag the poop trash bag.