Day 1: Add ½ cup brown rice flour and ¼ cup of water to a clean jar. Stir, cover loosely and let it sit at room temperature for 24 hours.
Day 2: Stir the starter, cover loosely and let it sit at room temperature for another 24 hours.
Day 3: Add ½ cup brown rice flour and ¼ cup of water to the jar. Stir, cover loosely and let it sit at room temperature for 24 hours.
Day 4-7: Discard half of the starter from the previous day and add ½ cup brown rice flour and ¼ cup of water to the jar. Stir, cover loosely and let it sit at room temperature for 24 hours. Use a rubber band to mark the level of the starter right after it is fed. The starter is ready to use for baking when it rises by 25-30% in the jar after a feeding. Depending on the temperature, this could take anywhere from 6-12 hours. Warmer temperatures will cause the starter to grow faster.