To start a fire, you can use any lens to focus sunlight on tinder. A magnifying glass, eyeglasses, or binocular lenses all work. Place the lens in such a way that you are able to concentrate the sunlight in as tiny a spot as possible. And within no time you should be able to see smoke coming out.
The only drawback with this method is that it needs sunlight to work. So if it’s nighttime or the sky is overcast, you’re out of luck!
Collecting drinkable water
Water is essential for cells, organs, and tissues and helps in regulating the body temperature as well as in maintaining bodily functions. The body continuously loses water through breathing, sweating, and digestion, so it is important to keep rehydrating. You can survive without water for 3 days, but you will feel severely dehydrated even after one. Moreover, getting drinkable water in a survival situation can be tricky, so knowing techniques to get it is of utmost importance.