Add oats, water, and any additional sweeteners to a high powered blender. Blend for 20-30 seconds. Make sure to not over-blend.
Strain the oat milk mixture by pouring through a nut milk bag or thin towel over a large mixing bowl or pitcher. If you'd like, you can double strain the mixture to make sure all the sediment is removed.
Transfer the oat milk to a sealed container and store in the fridge.