DIY: Rocket Stove Mass Heater - it warms your house for almost nothing! This post has videos & lots of info about these heaters + materials used to build them. You may already have some of the materials.
Green Fire Rocket Stove - The perfect stove for the camper or outdoorsman, this rocket stove is an economical but highly effective way to cook off-grid. It requires very little wood, retains heat exceptionally well, and produces minimal smoke.
Kelly kettle trekker aluminum - boil water and cook food at the same time with a few twigs thanks to this ingenious device (it is shaped like a volcano inside). One of the smartest backpacking items ever. and 60 bucks. I adore mine.