Follow along this instructable to learn how to create your own biogas at home with this build that is cheap and easy. You will produce gas to use a bunsen burner for about a half hour and to produce that you will use kitchen scraps and other compostables.
You will end with the biogas and the left over slurry makes a most excellent compost for your gardening needs. Chitlange Sahas show how he made a biogas maker to supply gas for his home. Using simple items he made it all himself. Check out the tutorial on Instructables. Pretty amazing for a 14-year-old kid.