FYI:
I have absolutely no qualms about killing mice at home- that's MY turf. But when camping I manage things differently. I mostly boondock in very remote locations, and I think of the critters there as wildlife and don't feel comfortable killing them. Not their fault I'm in their territory with such an attractive new-residence, right?
I've had good success with "sticky traps", which allow for live release away from camp. One squirt from a Pam can, and away they go...And believe me-they don't come back!