If you would like to build your own rocket stove Lds Prepper has this great video to show you how its done.
This is great as an emergency cook stove and its great for camping as well.

Build A Rocket Stove, Step-By-Step
Solo Stove: Ultra Light Weight Wood Gas Backpacking Stove, Emergency Survival Stove, Wood Burning Camping Stove
Landmann Rocket Roaster Dutch Oven
StoveTec Deluxe 1 Door Stove (Wood & Biomass Fuel Options)