Mix equal parts flour and water in a clean jar
Use about 50 g flour and 50 g water to start
Stir until no dry flour remains
Cover loosely with a lid or cloth
Leave at room temperature for 24 hours
Discard half of the mixture
Feed with equal parts flour and water again
Repeat discarding and feeding every 24 hours
Keep the jar in a warm spot
Continue for 5 to 14 days
Watch for bubbles and a sour smell
Use the starter when it doubles in size after feeding
Store in the fridge once active if not using daily