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.
[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]