Unstopping the vial of love potion, Hermione dropped in the blood she'd collected from Aberforth during her secret visit to Level Eleven. Once it was well combined with the potion, she used an instrument a lot like a Muggle syringe to fill each of the chocolates with some of the adulterated potion. Her plan was to keep drugging her intended victim until the day they were ready to complete the next and final step of the plan. All warnings from the old hag to keep the dosage low to prevent insanity were ignored. She didn't care. The remainder of the Aberforth-spiked love potion went into the secret compartment of her desk where she hid her other potions. She would need to keep spiking chocolates or her victim's tea if she wanted it to be effective. The only person who knew the compartment existed was Rabastan and he wasn't likely to notice one vial was different from the others if he chose to take a peek inside.