All sorts of green tea out there. The generic stuff that most people drink in an office is rather nice - not much flavour, but apparently huge amounts of caffeine. While I was living there I also developed rather a strong liking for some of the barley teas, although like the green teas, there are so many out there that it can be a bit hit and miss. Which is a long winded way of saying try a few if you get a chance. You know, Because.

Good luck on the second part of milk & hotels... You'll get packets of whitener meant for coffee. Most rooms will have a fridge though and convenience stores will all sell little cartons of milk.

Don't know if anyone else has mentioned it, but Japanese milk plants usually/often treat milk at a lower temp than is common in many other countries. That means that milk will often retain the, err, "original" aroma of raw milk. It's not off, it's meant to be like that. Of course, when it is starting to go off you can't tell.