Most deserted islands are deserted because they have salt water instead of fresh water. Water makes up more than two-thirds of our body weight and constitutes 95 percent of the brain, 82 percent of our blood and 90 percent of our lungs. It works in a variety of ways to keep our bodies healthy, regulating metabolism, digestion and working to prevent various cancers. In order to survive, water filtration systems must be devised to turn salt water into drinkable water and to catch rain when it storms.
Food can be hard to find on a deserted island. Begin with fish. An excellent source of omega-3 fatty acids, all fish work to reduce blood pressure, promote healthy brain function and decrease chances of heart disease; they are also rich in protein, fatty acids, vitamin D, calcium and a variety of minerals. Coconut is also very healthy, rich in protein, vitamins A, B, C and multiple minerals. It also works to destroy intestinal parasites, strengthen muscle tissue and its oil can be used to heal cuts.
Fire is a multipurposed necessity to survive on a deserted tropical island. It provides warmth in a cold environment, heat to cook food and light when the sun goes down. If stranded without matches, a cigarette lighter or firesteel, don't worry. Sparks can be made by rubbing sticks against each other or striking stones together. Don't let the fire go out once started. Its smoke will be a signal of your location and draw attention from surrounding areas.
Select a location to sleep. If you have a tent on hand, go to the most deserted place available to stand out. If you are going to create your own tent, find somewhere that provides protection from wind, the glare of sunlight and prowling animals. Make a temporary hut with flexible materials such as bamboo, bark and leaves. Layer leaves from the bottom up when creating the roof to prevent rain leakage, and steady your tent against a rock or tree if possible for added support.
