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This is a great project to have at home for that just in case moment. Bio-filters are a great alternative
This is a great DIY option to learn about in the event SHTF and you need a clean water filtration system larger than a Lifestraw. As you can see by the picture the water filters through three separate layers, gravel, sand and activated charcoal. The gravel removes the large pieces of debris, the sand removes the smaller particulate matter and finally the activated charcoal removes bacteria and some chemicals. However this system does not completely remove 100% of everything harmful.
To completely kill all pathogens just boil the filtered water. See how to make this awesome long term water filter below:
Bonus: How to Make Pemmican, the Original Survival Food
Invented by the natives of North America pemmican was used by Indian scouts as well as early western explorers.
Native Americans spent a great deal of time on the go and depended on having portable, high-energy, highly nutritious, and filling foods that would last for long periods of time without refrigeration.
Pemmican is a portable, long-lasting, high-energy food. It's made of lean, dried meat that's crushed into powder and mixed with hot, rendered fat. This makes it one of the ultimate foods to have stockpiled for when SHTF or disaster strikes.
People really should avert their gaze from the modern survival thinking for just a bit and also look at how folks 150 years ago did it.
These guys were the last generation to practice basic things, for a living, that we call "survival skills" now.