I have tried several recipes for almond milk. I found one recently that I have tested in my non-scientific kitchen. This simple recipes seems to me to make the almond milk last longer.
4 cups Filtered or Alkaline Water
1 Cup of Almonds
Bring the water to a boil. Turn off the burner. Pour the almonds in the water and let sit for 1 hour.
Pour the entire batch into the blender or VitaMix (r) until smooth. Strain with a strainer or milk bag.
This makes about a quart. And easily lasts for 3 to 4 days. Maybe longer.