>silver
Absolute must. 99,99 pure silver (coins, jewelry, etc) can be used for treating infections, purifying water, increasing shelf life of stuff like milk and even making medicine. Learn how to make colloidal silver with a simple battery and distilled water and you will never have to worry about infections ever again.
inb4 muh argyria
Jewish hoax just like most other things. The only cases of argyria were caused by retards taking 50ppm ionic silver solutions with salts added in them. Colloidal silver cannot cause any side effects unless you're retarded and make a 60+ppm solution with salts. Silver is something anyone can make in their homes with just $40. Pharmaceutical companies can't make money off of something this easily home-made and so they scare people away by telling them they will turn blue.