Question: how much do you feed your sourdough starter?
Answer: Feed the starter 1/2 cup (4 ounces, 113g) water and a scant 1 cup (4 ounces, 113g) all-purpose flour twice a day, discarding all but 1/2 cup (4 ounces, 113g) of the starter before each feeding. It should soon become healthy, bubbly, and active.