The English should be "To drink cows' milk" not cow milk. Cows' is the possessive of plural cows. At a push it could be cow's milk if you are drinking it from a single cow but that is not how 99% of us get our British milk.
To drink sounds like: a da.
But shouldn't it sound like: a bea?
Well done Kevin for pointing the "cows' milk" versus "cow milk". I have reported it. Much good it may do me.