I put milk in mine, 2% usually but I prefer whole. Sugar or honey. Started putting coconut milk in mine but there isn't a noticeable difference from regular milk.
Edit:Haven't tried black coffee much but not big into sweet so its not bad. The consistency is just really "thin" to me. Hope that makes sense.
[quote][b]Mentor Edit:[/b]
[spoiler]Hello OP or anyone choosing to read this message. I've moved this thread over to #OffTopic. I'd suggest reading Cozmo's posts on each forum for what does and does not belong in each forum section. If you have questions regarding my movement, please message [url=https://www.bungie.net/en/Profile/254/2351187]All The Players. [/url][/spoiler][/quote]
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Try Planalto coffee. It's delicious black, like chocolate malted milk, only, coffee flavoured, and thick, if that makes sense. Try www.pact.co.uk. Not sure if they deliver to the U.S though, im sure they sell it in a thousand other places.