The biogas producer will provide you with a biogas backpack which contains 3-5 hours of cooking energy. This is affordable to buy and easy to transport.
When you have arrived home, connect the biogas backpack to your biogas stove, and apply a weight on the backpack (for example and old tire or a piece of wood).
Biogas has a strong flame which you can comfortably adjust. Contrary to firewood and charcoal, biogas will not make your pots & pans dirty, saving you time on cleaning.