according to wikipedia, non sour dough breads existed long before commercial yeast packets, but they are a little vague on the how they were made. almost all modern recipes call for the little yeast packets. This might be kind of an odd question, and maybe not the right subreddit so I appologize if I done goofed, I just realized I really don't know much of anything about the history one of the main staples of civilization, i.e. bread.