All you need for a fishing survival kit is 2 small hooks and a two larger hooks, 20 yards of line and a couple of lead sinkers.
People put a lot of frivolous stuff in their kits like swivels and bobbers and so forth. The only time you will ever needs swivels is a) if you're fishing with a spinner or spoon that tends to twist your line during retrieves or b) to quickly switch lures when you are fishing and you're not going to be doing that when survival fishing.
And, by "swivels" I mean swivels with quick release snaps attached. Generic swivels are even more useless.
Sorry, but must respectfully disagree. Only 4 hooks, some line, and some sinkers? Mind you, that is a "bare bones" kit... Hooks are small and the weight is so minimal, so carry a decent amount... The more hooks, the more you can set out at once, increasing the likelyhood of catching a fish. Ditto on the split shot.
Swivels are very useful, as someone else posted, as a way to keep a fish from stressing a line, esp. if left unattended.
How do you feel about large gaff hooks?