"And I have a few from the summer," Hermione admitted, shrugging. She looked at both of them, and then added, "I was thinking ahead. I knew we might need the polyjuice at some point for the search, I just wasn't sure how early. It was bringing the still brewing potion to the castle that was the real problem..." Luckily, Professor Dumbledore seemed to have had the same idea, and one day at the Burrow she'd gone to check it and found it missing.