I have to admit I was inspired to ask you this, because I read that this is an actual interview question for a sandwich shop. Thought, it was interesting.
I'd start by ransacking the Mormon's who have food stores for the apocalypse they think is coming. Or, maybe like the movie Zombie Land, I'd be on a quest for Twinkies. (Probably wouldn't answer this way in an interview LOL).
What would you do?