Add the raw almonds to a bowl, and add enough water to cover the almonds by about an inch. Soak overnight.
Once the almonds have soaked at least 8 hours, drain out the water, and rinse the almonds with cold water.
Next, add the almonds to a blender, and add in 5 cups of filtered water. Blend the almonds on high for at least 60 seconds, or until the almonds are completely pulverized.
Line a pitcher with your nut milk bag, then pour the milk into the bag. Squeeze all of the liquid out of the nut milk bag, and set aside to use the pulp later.
If you want to add any sweeteners or flavors, pour the milk back in the blender. Add vanilla extract and maple syrup (or sweetener of choice), then blend for another few seconds on low. Pour the finished milk into a container with a tight fitting lid and store in the fridge.