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Originally Posted by Skybird
POTASSIUM PERMANGANATE
Always to be carried with you when doing expeditions and travels! It can help to desinfect water, desinfect wounds, can help to fight fungal infection of your skin (feet!), makes wonderful huge red markings in the snow with just some very few crystals of it, a few crystal already colours litres and litres of water red like blood (well, violet...), it helps you to make fire by mixing it with glycerine or glucose and then add friction, it is an antidot against some types of poisening including phosphorus poisening, it helps to fight parasites (in your hair for example), and even smallest quantities already are sufficient to be carried in you survival kit. We used it repeatedly to treat water if we were not saure of the quality. Doesn't taste well, but - on all travels I did, I never suffered from any kind of health problems deriving from bad water.
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Of course, be careful when using it for the treatment of drinking water. This requires only a very small amount. Concentrated solutions are corrosive and may cause lethal internal burns. (the same is true for other disinfectants like bleach and iodine)