I have a variety of esbit-style stoves and solid fuel. Also some alcohol stoves with some meths.

Also a petrol stove, which I no longer use for camping because it scares me. I'd probably have to syphon petrol from neighbors' cars (after they've turned into zombies and been decapitated, or whatever).

For the medium term, my main hopes are pinned on an open fireplace. I have a stock-pile of coal which should provide warmth and cooking for a few months.

Long-term I'm probably stuffed regardless. I live on the edge of the countryside so hopefully could find enough wood. A lot depends on the situation, eg whether there were other people trying to collect the same wood.
Quality is addictive.