Using a nut milk bag:
If you are planning to make your own almond milk on a regular basis, buying a nut milk bag is a great idea. This one
(affiliate link) is the one I use and recommend. To strain milk using a nut milk bag, place the bag in a large bowl, pour the milk over it, tightly squeeze all the juices out as much as you can until there is no liquid left. Pour the milk in a bottle with a tight-fitting lid and refrigerate.