1. Fish Hooks
With nothing but time on their hands, and the ocean's bounty just out of reach, many nautical survivors have turned safety pins into fish hooks while adrift in rafts and lifeboats. You could leave the pin open and straight, or bend the pin into a gentle curve. The odd bit of flotsam could be your first bait, and once you hook your first fish, its guts can provide you with even better bait.