Human: How can I make a sourdough starter? Assistant: 
To make a sourdough starter, you will need to mix equal parts of warm water and all-purpose flour. Stir the mixture together until it forms a thick paste. Place the paste in an airtight container and leave at room temperature for 12 hours or overnight. The next day, add equal parts of more flour and warm water to your paste and stir. Repeat this process every 12 hours for 3 days. After that time, you should have a sourdough starter ready to use!