What tpy of medicine can u use or make when stuck on an island?

just out of curiosity, let say ur stuck on island in ur hurt n u got no medicine u don't really no anything bout plants.....here the part can u use ur own pee as medicine...lol...what would u do if ur stuck on and island after a Cruise ship what the first thing u would do?

Saw this in movie (the pee part when a guy got hurt n a men took out a tuna can with medicine he made from his pee)....

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