Measure almonds into a container and cover with filtered water. Allow to soak overnight. This softens the nut considerably and makes it easier to blend, leaving less particles of nut in the finished milk (plus you get some of the benefits of soaking nuts too!).
Drain nuts and place in a blender. Add 4 cups of filtered water and blend until smooth, approximately 1 minute. A second blend may be necessary, since almonds are a tough nut and are hard to completely grind.
Strain through a fine mesh strainer or nut bag. The pulp is great in homemade granola bars!
Store milk in the refrigerator and enjoy cold.
For two cups: 1/2 cup almonds, 2 cups water For one cup: 1/4 cup almonds, 1 cup water