First Day: Mix all of the ingredients in a glass jar and cover with a cloth. Set aside for 24 hours.
Day 2: Repeat the previous day by adding 1/2 cup brown rice flour and 1/2 cup water. Set aside for 24 hours
Day 3: Discard half the mixture. Then add 1/2 cup brown rice flour and 1/2 cup water. Set aside for 24 hours.
Day 3-6: Repeat day 3.
Day 7: Feed your sourdough twice (12 hours now instead of 24 hours) with 1/2 cup brown rice and 1/2 cup water.
Now you should have a healthy, bubbling starter that is ready to use.
If the sourdough starter separates and liquid starts to form at the top of the starter, pour out the liquid and continue to feed it.