I like to pee in a foam rocket that is from a Pop Science kit. Now is has a yellow crust of dried pee residue around the lip of the rocket. And it smells strongly like urine. Have you ever done this kind of thing before?
I don't have a rocket right now, but that's the cup I store frozen pee in until summer when it's useful. It's on a stick so I can lick it when I'm dehydrated and our community is out of water.