1 cup old-fashioned rolled oats
Pinch of salt (optional)
1 tablespoon raw honey or pure maple syrup (optional)
In a medium bowl, combine the oats and 4 cups cold water and stir to combine. Allow to soak at room temperature for up to 1 hour.
Drain the oats (discarding the water) and rinse them. Transfer the oats to a blender, add 4 cups fresh water, and the salt and/or sweetener, if using. Blend until completely smooth, about 2 minutes. Strain through a fine-mesh sieve and chill. Keeps up to 5 days in the refrigerator. Shake before using.