Place walnuts in a medium bowl and fill with enough water to cover by 1 inch. Cover and set aside. Soak at room temperature at room temperature to soak at least 1 hour to 12 hours for easy blending.
Drain walnuts; rinse thoroughly. In a blender combine walnuts, 3 cups water, honey, vanilla, and salt; blend on low until very smooth, at least 2 minutes. Serve immediately or store in the refrigerator for up to 5 days.