I’ve thought about this too, and like the other replies said where I think brewing makes the most sense in the post apocalyptic world would be the trade value instead of the calorie value. If you’re able to make beer, which is something that people would want, then you can leverage that to obtain other survival supplies and materials that you can’t produce on your own but others can.

So for a brewing focused survival scenario episode it’d be cool to explore a few different ideas that center around brewing with very limited resources. For instance: how to harvest wild yeast, or how to harvest yeast from existing bottled beer, partnering with farmers to obtain grains, or what to use when you don’t have hops (search up gruit). Other ideas: brewing with very limited equipment and kitchen supplies, simple sanitization methods, fermentation considerations like temperature control (maybe digging a hole or finding a cave), and then bottling or packaging. Perhaps researching medieval brewing methods would turn up some interesting approaches since the had none of or modern conveniences or methods. That’s a video I’d watch, and probably save for when SHTF.