Oatmeal is the exception (along with rye for the bread) for all grains that is permitted. The water-soluble fiber is very valuable, and helps to cushion the juices coming down the pike. It provides soft bulk to help move the contents of the intestines along. That does NOT mean that all grains are good and consumable; only that oatmeal's benefits outweigh its properties as a grain.
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Along with the bowl of oatmeal, you will have your first juice.
Depending on your schedule, this can be an 8oz ounce glass of fresh squeezed orange juice or carrot-apple juice.