THE KITCHN: How to make your sourdough starter
Equipment:
2-quart glass or plastic container (not metal)
Scale (highly recommended) or measuring cups
Mixing spoon
Plastic wrap or container lid
Instructions:
Making sourdough starter takes about 5 days. Each day you "feed" the starter with equal amounts of fresh flour and water. As the wild yeast grows stronger, the starter will become more frothy and sour-smelling. On average, this process takes about 5 days, but it can take longer depending on the conditions in your kitchen. As long as you see bubbles and sings of yeast activity, continue feeding it regularly. If you see zero signs of bubbles after three days, take a look at the Troubleshooting section below.
Day 1: Make the Initial Starter
4 ounces (1/2 cup plus 2 tablespoons) all-purpose flour
4 ounces (1/2 cup) water
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