What would come in the Potion? Oh Merlin, this was the part of potions that made Selina want to throw up. The actual brewing it practical part of the lesson always ended in some form of disaster. How was it thag she, who was commonly referred to as blow up in potions, always came back to this class? Well she knew the answer to that- she was required to have the class up until OWLs. After that she would spare Lafay the headache of Selina's awful potion brewing.

So when she asked the question Selina went with the only answer she knew, "Ma'am... Perhaps water?"