The bad news: you're stuck on a desert island and you don't know how long you will be stranded there
The good news: you happened to be transporting a large shipment of goodies (and who knows...maybe there's a big refrigerator/freezer on this island too! And perhaps you're also stranded with a rocket scientist and a millionaire, and a hot actress....)
What edible snacks would you hope you were shipping? Twinkies? pretzels? potato chips (what kind?) Hersheys bars? salt peanuts?
[please note the point of this exercise is simply an entertaining way to ask the rather boring/pedestrian question: 'what's your favorite snack'?
but if you want to turn this into a "I would choose potato chips and construct a raft using the vacuum sealed bags..." type of exercise too go right ahead.]