Hi, guize! OK, so
You can attract wild yeast that way. You can also make yeast out of potatoes. Sour dough usually starts with a little yeast.Why don't you just make sourdough? I don't make bread because I'm not a big fattie, but my understanding is you can make sourdough yeast with nothing more than flour and water.
And yes, BreAD MaKeS YoU FAt