I think it's fair to call it milk. It's definitely not a beverage as a soda or beer would be. It used to be "secretion from the mammary glands of certain farm

I think it's fair to call it milk. It's definitely not a beverage as a soda or beer would be. It used to be "secretion from the mammary glands of certain farm animals" but you can rephrase it to "liquid that is taken from a particular protein source — a coconut, a soy[bean], a cow, a goat..."