George Eisman (vegan dietician) told me that the best is to make your own, here's how easy:
At night take a handful of oats and toss them into a mason jar. Let them soak overnight. In the morning, put a lid on the jar, shake well. If you like, add a little agave or maple syrup to sweeten, you can add a dash of vanilla or almond extract. Whatever you like, however much you like. Custom made oat milk.
I haven't done this yet though I definitely will. My only concern is the temp. I am not fond of room temp oat/soy/rice milk. Maybe tonight I'll soak one in the fridge and one out. I'll let you know if it makes a difference and how it turns out, etc.