Don't have time to watch right now. Fire making is the most important, probably.
Not sure if you could use lenses to make a fire with the sun. If you could some how take them apart you probably could.
If you had some really thin wire, especially something like steel wool, you can connect the two contacts of your battery to cause it to burst into flame - or in case of the wire if it is too thick, cause it to get hot enough to ignite some dry grass.
Worst case would be to puncture a lithium ion battery pack, but you can only do that once per battery.