http://www.cleverscampcamp.com/camping-coffee-cup/

Why dont people drink coffee on Mt Everest?
In the books i’m reading and any specials i see on TV, it is always a cup of Hot Tea that people drink at all of the camps.
There is pros and cons with this.. Oolong, green, and white tea have even less caffeine and even more antioxidants. In fact, white tea has shown to contain the highest levels, and is one of the best sources when measured by volume for antioxidants in the world! So if drinking for your health, tea will always beat coffee. In the a high mountain.. i think you drink for strength, not for the delight!
JetBoil Java