Place nuts in water to soak overnight, adding 2-3x water to make sure the nuts are submerged and will remain covered even after they increase in volume.
In the morning, drain the water out.
Add nuts and four cups water to a high-speed blender and blend until smooth.
Pour liquid into a nut milk bag or cheesecloth fabric to allow to strain. Transfer nut milk into a glass jar. Store it in the refrigerator for up to one week.