We buy them still in the shell from a local seafood market.
Assuming you're going to eat them that same night (best, but not absolutely required) and that you're talking car camping, not backpacking, it's pretty easy. Put them in a cooler on top of (not in) ice. You don't want to drown them in the melting ice, but you do want to keep them cool. Don't eat any that gape and won't close. Have a great time.
Awesome, that's great!! Thank you so much that was really helpful.
Don't transport them in a plastic bag, they will suffocate , if you have them in plastic you have to leave the bag open
Oh yes, thanks for adding that PHIL.
How are you eating them ?