If we're getting extra technical, it didn't say anything about drinking both of them at the same time. You could drink one and then drink the other. (I recommend starting with milk first, or else it might be difficult to complete both.)

To be even more technical and pedantic, it didn't say how much of each. If you drink a tiny amount of battery acid diluted in a large amount of milk, you'll probably be just fine and can do it over and over again.