Put the almonds and water in a high speed blender and process on high for 2 minutes (or if you have an Optimum G2.1, choose the 'nut milk' option in the menu.
Strain through a nut milk bag, keeping the pulp for another use and store the milk in the fridge
Notes
If the almond milk is too bitter for you on its own, you can sweeten it with a couple of dates and/or a tsp of vanilla extract. Also, you can soak the almonds in hot water for an hour or two instead of overnight if you're in a hurry.
Recipe by Planet Veggie at https://www.planetveggie.co.uk/homemade-almond-milk/