In a large jar, whisk together brown rice flour, white rice flour and sweet rice flour. This is the flour mix you’ll be using to feed your starter.
In a large bowl, mix 1/2 cup water with 1/2 cup rice flour blend until smooth. Scrape the sides of the bowl clean, cover with a plate, leaving about a 1/2 inch crack for air circulation, and place in a draft free warm-ish place. The top of the fridge is a good spot.
Every 12 hours, or so, feed your starter with another 1/2 cup of the flour mix and 1/2 cup water.*
Repeat Step 2 for 4-6 days.**