Survivalist Light Bulb

Admittedly this is only good for day time hours and if there's sun. But for the survuvalist living out in the woods in a shelter with no windows, this could be a cheap solution.

Take a 2 liter pop bottle, fill it with water, add two cap fulls of bleach or a water purifying tablet and put something over the cup (Like a film container or anything just about). Then just cut a hole in the roof of your living quarters and stick the bottle in it and seal around the bottle and you have a 50-60w light bulb.

Here's the video:

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