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.