Place the oats, water, and acidic medium (see above) in a small, covered jar to soak overnight. No need to refrigerate this. In the morning, drain oats in a fine-mesh strainer for a few minutes. Using the back of a spoon, press the oats to get a bit more of the liquid out. If you don’t have a mesh strainer, just use a clean dish towel to gently wring the liquid out of the oats.