An empty bottle is an easier problem to solve. Magnus snaps his fingers to refill it for Five –to refill his own, too, though he's lost count on how many refills he's already had. The more the merrier?

"You're telling me this now? You could have led with that."

Otherwise, his plan was indeed probably to stare at it until a light bulb goes off... which also might take centuries.

"Who is she? And is she a native of this world? Where can I find her? Feel free to jump in at any point with all the answers."

Even just a name would be a start, as Magnus would probably have better luck getting a full explanation from the source.