This didn't seem to be mentioned in the above article, but you can get yeast from fruit - preferably pre-dried: https://twitter.com/shoelaces3/status/124425207

This didn't seem to be mentioned in the above article, but you can get yeast from fruit - preferably pre-dried: https://twitter.com/shoelaces3/status/1244252079041974272 https://twitter.com/shoelaces3/status/1244252079041974272 > Scour your kitchen for any dried fruit: grapes, raisins, prunes, apricots. Fresh fruit works too, but it's best to leave it unwashed, and given our current situation this is probably not a wise thing to do unless you've grown the fruit yourself and trust it. > Take your fruit (or, if using fresh fruit skins--please use your judgmenet), pop it into a jar, and add a little bit of water to it. 2 or 3 tablespoons (30-40 mL) is more than enough. If you stir the fruit around, you'll notice the water gets slightly cloudy. That's the yeast!