I have a knife(and perhaps a utensil too? and also a plastic bottle?), im in a biome of some lattitude and longitude. I have a phone/bulb/radio/whatever needs very little energy, but they're discharged. Theres no plug anywhere, im in the middle of nowhere. What contraption should i make to be able to get enough electrical energy to charge/power these devices and contact civilization? Answers such as "impossibru" will be pretty much useless, answers such as "You could build XYZ, but you'll need ABC which you could find lying around/harvest, if you're lucky in location OMG." will be of help :) .