How to make a "FOUR BLOCK" Emergency Rocket Stove (Concrete/Cinder Block Rocket Stove)!
Sometimes, in emergency situations, having clean water to drink becomes critical to survival. And building an emergency rocket stove is easier than you think. You only need 4 concrete blocks. Cost: around $5.16.
This short video shows you how to put it together. The stove funnels all its heat up under the bottom of the pan. It uses very little fuel -- just small sticks, twigs, and leaves. It cooks great and is wind and rain resistant.