How do you get food on an island?

That depends on a lot of factors! Tell me more about the island and your situation:

* What kind of island is it? A tropical paradise? A barren rock? A volcanic island?

* How did you get there? Were you shipwrecked? Stranded? Did you choose to live there?

* What resources are available? Are there freshwater sources? Trees? Edible plants? Animals?

* What tools do you have? A knife? Fishing gear? A boat?

Once I know more about your situation, I can give you more specific advice on how to get food on your island.