Place almonds in a bowl and cover with a couple inches of water. Soak the almonds in water overnight (about 8 to 10 hours). For a quick-soak method, soak the almonds in boiled water for 1 hour. Rinse and drain well.
Place drained almonds into a blender along with the filtered water, pitted dates, and chopped vanilla bean.
Blend on the highest speed for 1 minute.
Place a nut milk bag over a large bowl and slowly pour the almond milk mixture into the bag. Gently squeeze the bottom of the bag to release the milk. This process can take a few minutes so be patient!
Rinse out blender and pour the milk back in. Whisk in the cinnamon and sea salt.
Using a funnel, pour into a large glass jar and secure lid. Store in the fridge for up to 3 to 4 days. I recommend storing in the coldest spot in the fridge (typically the back) rather than on a door. Shake the jar very well before drinking as the mixture separates when sitting.
Tips: * If your dates or vanilla bean are dry/stiff, soak in very hot water for 30 minutes before using. Drain well.