Okay, when I first played 3-5 and heard Elise/Misty's book was called 'The Magic Bottle' I immediately assumed it was somehow connected with Dahlia's sinister bottle, but it didn't seem to.
But now I'm having second thoughts. Do you think it's implying that 'perfect relationship fairytale' Dahlia deluded Terry and Phoenix with along with the bottle was actually based on some old Fey family fairytale? Explains why someone like Dahlia could 'invent' it on the fly too, when it's so opposite to her own 'values'.

[And Larry got 'converted' to Misty's self-professed disciple by the book, too, kind of like Terry and Phoenix, except Misty never pretended it wasn't just a kids' fairytale.]

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I don't think any content in the book was ever specified - it could literally have been about a magic bottle pouring magic drinks for pixies and elves, for all we know.

Of course, I'd prefer coffee from mine!

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...I think you may be over-thinking it... (Of course you never know...)

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I think it was just Capcom referencing itself, if that. Maybe not that deeply.

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