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This knowledge could really save your life in a SHTF situation. The best part of the bottle to use is the bottom, because the glass tends to be thicker than the sides of the bottle, and much less curved. So when picking your bottle, pay special attention to the bottom.
I personally have not tried this but I have seen many videos and articles over the years. I wanted to share this skill with you all as in an emergency, chances are you will come across glass bottles pretty much everywhere. Even the beach! Check out the article and how to make them below 🙂