This is an extreme off-grid technique for generating methane natural gas that can be used for cooking applications. It’s a bit dangerous to play with gas like this – so caution is a must – but if fossil fuel derived gases are not desired or available know that it’s possible to make gas from waste.
“This is part one of a home made methane producing septic system. Show’s the air lock and the digester barrel, with gas all ready being produced.”
See more at Methane digester P#1 – YouTube.