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Lighting fire using the sun and a lens is a neat trick. You can also form a lens using ice. However, in most conditions where you need a fire to survive you don't have sufficient sunlight or sufficiently dry fuel for the method, so I'd recommend learning other methods for lighting fire, in particular the method of always carrying a lighter with you when you leave civilization.

You don't even need the bottle, just make sure the water is in the correct phase: https://www.youtube.com/watch?v=thbSSuo1Z00

That is absolutely amazing, and I will be trying that next barbecue day.

For those who don't know, on a slightly related nugget, you can also use any sort of fat as a lighter fluid as well. Cook up some bacon (for instance), collect the fat/oil from the pan, and next time you're grilling - a few napkins (or other sort of kindling) rubbed around in the bacon fat is more than enough to heat your wood/coal to burning.

Now to set those napkins on fire with a water bottle!

Unbelievable!

> litterly

> watter