> I don't need bread yeast that badly.
You can make your own out of dried fruit or raisins.
Heat water to approx. 35 °C. Mix sugar, water, and raisins into a large glass jar with air-tight lid, and shake until sugar has dissolved. …
Let it ferment 4-6 days. The yeast is ready when all raisins are floating and releasing lots of bubbles. Pour everything through a strainer, but take care of the liquid.
and https://www.sourdoughandolives.com/recipe/how-to-make-and-bake-with-raisin-yeast/