Back in my carb eating days, I would definitely make bread from scratch if I had a bag of flour and some salt. If I was given a bag of wheat, I doubt I would buy a grain mill; I would learn to live without bread.
I made pasta once; too much effort for the result.
I would definitely make yoghurt, presuming I could source some starter, and labneh. I would probably make other cheeses if none were available to buy, but there is no individual cheese I'd miss enough that a different variety would not be a substitute.
What favourite food that you buy now would you make in your kitchen if that was the only way to have it?