Soak almonds 8 hours or overnight in filtered water with sea salt. Drain and rinse. Optional: remove skins from the soaked almonds.
Add 4 cups / 1L filtered water to blender with soaked almonds, blend until completely smooth.
Strain using a nut bag or alternative (reserve the pulp!), pour into a clean jar and enjoy! Will keep for 3-5 days in the fridge, 3-4 months in the freezer.