You could bring your own food cooked / pre-prepared. There are grilling stations available around the area.
In the island, there are canteens or small restaurants which offers “paluto” (ask to be cooked) where you will choose the main ingredients of the food that you want to be cooked. Scallops, squids, shrimps and fish are the most common options. The prices range from PhP 150-200 per kilo plus PhP 20-50 cooking fee. Steamed rice is also available.
There are also small shops / sari-sari store selling canned goods and other necessities.