There's small cast iron pots that most places sell. RCBS, Lyman and others may have them.
However, you might also consider that small ladle with a wood handle. It's for the one bullet at a time (pain in the rear). Realistically I haven't seen any documentation suggesting that a frontiersman carried a small pot as it would weigh too much.
However, if you're out there with the camper (like I would since I've grown older and want more comfort), why not carry a pot? Heck, the car doesn't care.