If you haven't made a potato flake sourdough starter, yet, you should! I promise you will love it. Plus, it isn't high maintenance like you would think. Head over to this post to find out how to get your sourdough starter going. It takes less that 5 minutes. However, if you have a traditional flour/water sourdough starter, you could most likely use that as well. With that said, I'm not sure if the measurements would be the same.