Combine flour with liquid in quart size jar. Stir well. Cover with tight fitting lid and place on a shelf away from direct sunlight. Repeat with above quantities and continue to add twice daily until mixture reaches desired volume and is bubbly. My bread recipe* calls for 3 cups starter. It usually takes several days to reach this amount. The mixture should smell sour. The kefir or kombucha should keep it from turning rancid or moldy. If anything unsightly appears or it smells off, discard and begin again. Trust your instincts on it. Enjoy the starter in your favorite sourdough bread recipe!