I carry coffee on my bike every morning. It goes in my water bottle. I'm sure the hot coffee is leaching out all kinds of deadly poisons from the malleable plastic (it isn't a Nalgene... yet) but I get a huge thrill out of having warm coffee on my ride to work!

By the time I get to work the coffee is cold. I either drink it cold pretending it's an iced latte, or pour it into my mug and nuke it.