Very secret and hush-hush, so it's not entirely surprising.

[Eliot picked out his flask again, giving it a light wiggle.]

Always in reach. Was one of the first things I enchanted, with the help of a truly impressive party animal during one of his big holiday bashes. Basically endless, whatever I pour in is what comes out until I pour something new in it, tasty as the minute it went in the flask.

An absolute life-saver during finals, no one should sit through advanced theoretical mathematics sober.