If you think casein does not taste good then you are drinking the wrong casein. I cant say enough how incredible the Optimum Nutrition Chocolate Supreme tastes. Seriously, there are not even chocolate shakes that taste as good as this stuff. I have talked quite a few of my friends into this casein and they cant believe how incredible it tastes. If you like chocolate, I promise you will love this stuff. I have mine with a glass of milk. Never tried it with water.