I've been known to carry a pour over kit in my flight bag. I'll grind up some beans before I leave the house and throw them in a zip lock baggy. Pack some filters then all you need is hot water and you're in business. A lot of places will give you some hot water, or in the room I just run the water through the coffee maker. Gotta treat yoself when you can, life is too short to drink crap coffee! I have the BRCC kit in this video, but it appears it's no longer available. Plenty other good options.

https://www.youtube.com/watch?v=_2IGxVcXB8E