​ make a sourdough starter from scratch ​
You can ​ make a sourdough starter from scratch ​ in just about a week. I only recommend doing so if it currently is summer (or a very warm fall) where you are. While it is immensely satisfying to build a starter from scratch and subsequently use it to make a beautiful loaf of bread, I am a huge proponent of purchasing one for a few reasons, namely: when you purchase a starter, you are guaranteed to have a strong, vigorous starter from the start. In other words, you can start baking with confidence right away.