Membrane:
Why complicate a problem that was resolved successfully - and in a practical manner - by our grandmothers and mothers long ago?
My mom and grandmom always added that delectable Aztec delight, Chocolate, to my milk every morning before I went to school. I later found out that the Anglophone world had also discovered this great way to drinking cow milk.
I've yet to discover (or hear of) a better addition to cow milk. If you don't like Chocolate, you have to be the sole human being on this planet who doesn't.