Bilbo, being the fabulously wealthy son of the fabulous Beladonna Took, could afford to import whatever he liked from wherever he liked.
Those below the coffee-importing--social-- strata drank a brew made from Roasted Chicory Root. (Geh!)
--Helen
A much less fun answer sould be that when he was writing that chapter, Tolkien hadn't even realised taht elves would show up or that Gondolin's sowrds would make an entry... so he didn't yet know when he was writing about.
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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