Hmm-

What if you boil the water in a glass jar, let that cool, then add the coffee for "cold brewing?" The coffee may not be sterile, but you would have eliminated most of the microbes in the jar and water, at least. Pour the desired amount for each serving into new baby bottle liners. They come pre-sterized, so they should not be a source of new contamination. I would probably then freeze the sealed bags until the trip for good measure.

It seems like a lot of trouble for coffee. As much as I like and dring it at home, I stick with a cold coffee "latte," or coffee beans mixed with cranberries and chocolate, maybe other stuff, like a breakfast trail mix. That's me, though.

CM