[mikro2nd]

No, you probably can't. To make biogas on any reasonable scale is at least a village-scale thing; a single family/household cannot easily produce sufficient raw-material to manufacture useful amounts of methane unless you commit to growing biomass just for conversion. (See also another comment below where livestock are involved, so another path to a sufficiency of raw material.)

I was very keen on the idea of making my own biogas (for cooking) when starting out in my self-sufficiency efforts some >25y ago, and the entire sewage system is designed to make conversion to biogas production easy, but the reality is it's just not ever going to produce any significant quantity of methane without some serious supplementation. Add to that, biogas digesters slow down significantly in Winter, even here where we never get freezing temps. In places that experience serious Winters you need to figure out ways to heat(!) the digester to keep it working lest the raw material inputs back up and cause... a mess that will thaw in Springtime with (cough) challenging results.