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All the water is poison. We need it to survive but for the most part, it all needs to be treated. There are even boil notices on the tops of mountains. That is just the reality of the water supply. In fact, Its basically been that way forever. That is because everything washes into the water. Dead animals, feces, even in the wild the water can be contaminated
that said, you need to have a method of cleaning the water that you come across in the wild. In some environments its hard enough to find water but then you have to sanitize it, as well. However, if you have these three items you can make sanitizing that water much easier.
The number one items for dealing with water in austere environments has to be the steel bottle. The easiest way to sanitize water will always be boiling it. It doesn’t create the best tasting water but it kills the pathogens that might make you sick.
Having extra cloth gives you the ability to make a biofilter. Using rocks, sand and charcoal you can create a filter withing a sleeve or in multiple layers of cloth. This can actually have a profound affect on the taste and quality of your water.
You should still boil it after the fact but it will improve it vastly.
While not a permanent solution by any means, the straw filter by companies like Sawyer or Hydroblu gives you the ability to drink directly from a water source. In the very worst scenario you are going to be able to deal with water without any effort other than getting it from the source, through the straw and into your mouth.
If you don’t have water in 3 days you will die. If you drink bad water, it will cost you everything! Keep that in mind