Making good coffee on a bushwalk is tricky. You could take an old-fashioned stove-top espresso maker and put in on your stove, but those are very very heavy, and don't leave much spare weight for coffee. Or you could take a plastic plunger (Bodum makes them) but it's still a bit heavy. Or you could be really clever and take a Vietnamese coffee filter (a 'phin'), weighing in at 25 grams! You just pack in your coffee, sit it over your cup and add boiling water. 4 mins later you have great-tasting coffee. It will set you back a whole $2 at your local Vietnamese grocer or bargain shop. (Or you can buy on ebay or amazon).
(This is also a great tip for coffee tragics travelling in places like England where espresso is hard to find. Just make your own in the hotel room - all you need is a kettle).
