"That sounds like a fair deal." She can use the weaker variant of the potions to learn how they are made. And she reaches into her clutch, to bring out her other potion ingredients, each one has enough in its bag that they will be able to share. (And it might be a little weird, seeing her pull large bag after bag from that tiny little clutch).

"Felix... I also want to introduce you to my Patronus." Hermione gestures with her wand. And a spiritual Otter comes out. The creature swims in the air, contently.

"If I have an urgent message to send, I usually use him."