If you were to be stuck in the wilderness, and needed to survive, what three things would you want to have? No cars, phones, complete survival kits, etc. those just make it less fun. Only put single, survival type things in your list..you should be able to tell if it's "cheating" or not. If you choose food, don't be outrageous in it...an energy bar, not a case of them from costco. Guns can count, but bullets are separate...maybe ten bullets if you choose to have them as one of your three things.
Also, what "Creature Comfort" would you want? This can be something like a book, harmonica, stuffed animal, etc. Pets are allowed, as long as it's not your hunting dog, or your giraffe who gathers coconuts for you.
Mine is my dog, Buck. =]
Have fun, and be creative!