I can verify that drink's label changes between "Vile Concoction" and "Cure Vampirism" depending on the Sim selected, and if they can be cured. That is more complicated than it sounds. You can not be cured while in transition. Also, when a child is a vampire, they can not be cured as a child, and when they age up to a teen it can be buggy. They are a vampire then, and the drink should work, but I have had to save and reload to get it to work. So the label changing is a nice clue.
My current household is mixed. I can have 5 dishes in the fridge, 4 can be excellent quality non-vampire food, and one bowl of plasma fruit salad. Guess what every non-vampire beelines for in the fridge! Every single one.