Soak the almonds and cashews in a bowl of water, at room temperature for at least 6 hours.
Strain soaked nuts and place in blender along with 1 cup filtered water, blend until smooth.
Strain the nut milk through either a nut milk bag or a fine mesh strainer.
Pour strained nut milk back into blender along with coconut milk and any other add-ins you’d like. Pulse a few times to combine then store in an airtight container in the fridge for 4-5 days.