I use a Bonavita ceramic wide base immersion dripper and/or a Flair Espresso and/or a Secura French Press.
If I have electricity, I use an electric kettle. Without electricity, boil water on a camping stove.
I must admit, being somewhat obsessive:decaf:, I used to travel with a Fresh Roast 500 coffee roaster a long while ago.
I no longer do that.