Couple of other points. With the French press you also can play with how much coffee you use to make the brew as strong as you want. That plus playing with brew time will let you get it just the way you like it. Also, when I travel I now confiscate those little coffee packs from the in-room coffee makers and use those in the press. I usually add some really good grounds to it, too, for more flavor. But the coffee packs are neater, store well, last a long time, etc. Did I mention they''re also free (so to speak)? Experiment with them and still use regular grounds with them to suit your taste buds/caffeine dependencies.
Oh.....and keep some realy good dark chocolate onboard to go with that afternoon caffeine fix.
Yours in caffeine addiction,