Elf-made wine is canon as Snape offers it to Narcissa and Bellatrix in Spinner's End. Maybe it's just the elves that make wine as the only other reference to wine I recall is the nettle wine in Snape's first year logic puzzle. Though the wizards definitely do other stuff like butterbeer, gillywater, red currant rum, Single Malt Whisky and Ogden's Old Firewhisky.

Hmmm. You have a point about the chocolate. We Muggles do rather obsess over it. I think Honeydukes may be more creative on candy in general, but maybe Muggles should have the edge on chocolate, especially dark chocolate.