Mix 50 g flour and 50 g water in a clean jar
Stir until no dry flour remains
Cover loosely and leave at room temperature
Wait 24 hours
Discard half of the starter
Feed with 50 g flour and 50 g water
Stir well and cover loosely
Repeat discard and feed every 24 hours
Keep at room temperature until it becomes bubbly and doubles in size
Use a consistent feeding schedule
Switch to twice-daily feedings if the starter rises and falls quickly
Continue feeding until the starter is active and ready to bake with
Store in the refrigerator after it is established
Feed before baking to refresh it