Place the oats, 1/2 cup water, and yogurt or kefir in a bowl. Mix and cover with a cloth or plastic wrap placed loosely on top. Let sit in a warm place for at least 7 hours.
To prepare the oatmeal:
Transfer the fermented oats to a saucepan and add the 3/4 cup water*, the cinnamon, and sea salt. Bring to a boil then lower to simmer. Cook for 5-10 minutes or until the water is absorbed.
Transfer to a bowl and top with milk, pistachios, maple syrup, bananas, and blueberries. Serve immediately.