Lost on Island
If me and another person where to be marooned on an island with only 3 things. They would be a knife for cutting, life straw for drinking, and flint and steel for making a fire. These are the items that we would need to survive.
First, we would use the knife for multiple purposes. One would be for cutting down small trees so that we can make a shelter for ourselves. Another is for sharpening sticks in to a point, so that we have spears to hunt down animals and have food to eat. The knife will also be used to skin the animal. We would skin it so that we can get the meat and be able to cook it.
Secondly, we would take a life straw with us. The life straw is a straw that has a filter built in. It allows you to drink water strait from a stream or pond. It filters all bacteria out of it. We would use it to get us our water.
Lastly, we would have a flint and steel with us. This is used to start fire, so we would make sparks with it and get a fire going. We would use the fire to cook our food and to keep the mosquitos away.
We would get rescued from the island because we would use the fire to make a smoke trail. Then passing ships would see the smoke and come save us. That is how we would get rescued from the island.