Genius idea!! I used to do that in school. I'd bring a biiig travel mug with coffee in the morning, and around lunchtime I'd boil some water in the microwave in the cafeteria and add a tea bag. Once it was good to go, I'd pour it in my mug and add a TON of ice. I'd have my own Tazo iced tea.
I like the mint idea mandalinn. I wish I had mint plants.