Instant coffee is a nice thing if you don't have anything else that tastes more like coffee...but that really is the last resort, because it is a substitute and it tastes like it.
Chewing coffee grounds is not recommended by the ADA. But it will work if you give it enough time. Downside is people won't stop telling you that you have something in your teeth for the rest of the day . That, and it's generally an unpleasant experience.
That leaves camping coffee makers, percolators and french presses.
Outdoor / Non-Electric Coffee MakersColeman Camping Coffee Maker
Like my friends who were in the boy scouts always told me, it's good to be prepared. Coleman is pretty much the leader in mainstream camping cooking equipment and they have come up with some brilliant solutions for this acknowledged human necessity that is coffee. Coleman Camping Coffee Maker has got to be my favorite. It was designed for a coleman gas grill, but could be used over an open fire as well.
PercolatorsThe Coleman 14-Cup Enamelware Coffee Percolator If you are nostalgic and prefer a more "campy" feel to your experience, Coleman also still offers the good ol' percolator.
Percolators, boil the water and the coffee sits in a basket inside. After a period of time, you will see the top show a darker and darker color as the coffee is brewed...pour and enjoy!
Espresso PercolatorsBialetti 6800 Moka Express 6-Cup Stovetop Espresso MakerStovetop Espresso Pots) For the espresso addict, you do not have to give up your drug of choice, just because you don't have access to your thousand dollar counter-top machine. I have an antique espresso maker from when my grandma was a little girl that still works amazingly well, even at home on the stove! (Just like the one pictured here.)
Just a tiny pressure percolator you can sit over an open flame but it really makes a strong cup of coffee. The pressure extracts every bit of caffeine out of the grind and it is evident. As usual, espresso really packs a punch and one shot can give you a good boost when you need it quick.
French Press8-Cup (34-Ounce) Coffee Press
Basically, the French Press is about as simple as you can get. You boil the coffee in a separate container, and pour it into the press, wait, then press the grounds to the bottom and pour for a delicous hot cup of coffee. It keeps the grounds out for the most part, but the glass ones are difficult to camp with. The best part of this solution is you don't risk burning it.
Bodum 1548-01US Brazil 8-Cup (34-Ounce) Coffee PressCoffee Presses)
All in all, it's not a difficult task, a lot of people boil coffee and then let the grounds settle. Turkish style.
Desperation can lead down many paths, as long as it ends with coffee, you're okay.
Have a cup!