I always show you the best way to make fire with a water bottle. That's when the bottle is completely full of water, top shoulder tilted towards the Sun, the photons going through 6" of water, and then they exit out the opposite side into an extremely hot focal point.
Yeah but... what if you've already drunk half the water??? LOL! that's when you'd use this "2nd best" technique that I demonstrate within.
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Solar Ignitions Playlist
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How To Make Fire With A Bottle And Pine Needles
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