Black, strong, unsweetened coffee here--but not after noon. A few times a week, I have tea in the afternoon--black tea if I need a little pick-me-up, herbal otherwise. I make my tea very strong and sweet (I've heard it called smokejumper tea). Green tea makes me jumpy for some reason. I have to avoid ginseng for the same reason. I don't drink iced tea--have never liked it for some reason.
I would think that for the small amount used, real milk or cream would be best for avoiding chemicals (maybe dry milk for convenience), if you aren't lactose intolerant.