Ice cold beer. We all love it, but all that electricity we use keeping it cold. Why not let Mother Nature do the work for us? Some guys from Denmark invented the eCool ($300), a capsule that holds 24 cans of beer. You shove it deep into the ground until you decide to break open a cold one. While not ice cold, the eCool keeps beer cool enough. Buy multiple eCools and go around shoving them into your backyard as you prepare for the zombie apocalypse. Use this in tandem with the zombie apocalypse kit.