Rather than 2 food sources, you'd need water plus proteins.
Without protein, the body begins to consume its own fat stores, then depletes protein stores. Proteins help keep muscles working correctly and keeps muscle mass from breaking down.
But, the body can live longer without any food than it can without fresh water. If stranded on an island, it can be assumed the island is surrounded by ocean, which is salt water and cannot be consumed without serious health risk.
So, I'd hope I was wearing some good hiking boots or strong shoes because I'd need to go find a fresh water source (such as a waterfall or other moving water) and I'd need to find or make some kind of container to hold the water if I needed to transport it. I'd only have a few days to find fresh water before dehydration would begin to affect mental processes and make me physically ill and weak.
posiblly leaves,grubworms,
The basic plot consists of a group of boys who are stranded on a remote island when their plane crashes - killing the adults. The boys have to survive on their own merits - including finding food and making shelters.
well i would rather stranded on an island than suffer from the pain of teenagers!!
They get food and water and a shelter.
Basically food, water, and shelter.
To survive alone on an island, it is important to take plenty of food, or have food resources. You also want to establish a water supply, and shade so you don't get burned.
it depends on where they are stranded, if they are stranded in a place with no food they might possibly die.
it is the island and there are alot of food for them to survive
the awnser is food and water
Stranded at sea is rather general. Stranded in a lifeboat? Water, shelter from the sun and weather, is the main priority. It is possible to survive a long time without food - move as little as possible to save energy. Lack of water is more important. Collecting and storing rain water is vital.
build a bunker with food and drinks
The human can survive without air for 2 minutes, for water 2 days, and for food 2 weeks. Therefore, you would probably die if you have not eaten in that time. If you are stranded on an island, you can eat grass rather than starve for 5 months.