Start with lighter and limited fuel to start fire (or nothing on higher difficulty) and once that runs out, you'll need some other method of making fire to cook and distill water with.
edit: and I know animation is low on the priority list at this point, but I'd like to see more violent shark attacks on the player, thrashing, biting, dragging you underwater, and give the shark the ability to grab you from the edge of the raft and pull you off.