Salt is useful. Might seem like a little odd. but all the cool gadgets in the world arn't going to help if you can't last. salt to cure meat How to Preserve Your Meat using Salt Collecting and Exchange of Local Agricultural Content salt to treat wounds. You can make a salt water wash... Survival - BASIC SURVIVAL MEDICINE - Chapter 4, Page 5 you also need to replace your body's salt if you have been ohhh SWEATING for an extended amount of time.