How to make your own yeast for baking - The Verge
...If baking is your way of taking this moment to learn something new or become more self-sufficient, coming up with your own yeast could be the next survival skill to hone.

Baker’s yeast is actually just a fungus that, like me, loves eating sugar. So whether or not it’s in stock in stores, in reality “there is never a shortage of yeast,” biological engineer Sudeep Agarwala tweeted. “Yeast is everywhere!” he adds.

There’s a good chance you’ve already got what you need at home to get started. ...