Well while Foggy's thinking while chasing a butterfly.......
You are stuck in....SPACE. These are your Items : a Spacesuit with 6 hours of oxygen.(You'd die without it), some rations of astronaut food, a transceiver, a flash light, and some batteries.
Your spaceship has stopped working, the power is off, but there is still enough air to last 24 hours. You're frantic but still trying to be composed.
You must make it back to earth safely. (No magic, no teleporters, no portals, no warp point either.)