Coffee is not optional! If you agree then a suitable way to brew hot coffee will be on your checklist.
I found the Bodum Travel Press combo travel mug/French press is an excellent solution.
It's easy to use and doubles as an insulated travel mug for hot or cold beverages. You just spoon in some coffee, add hot water, wait a minute and push down the press. Of course, you'll still need a way to make hot water!
Also available in acrylic with insulators of various colors or stainless steel.