About anything can be used for a mortar and pedistol.  Camping I often just use a knife handle and a cup.  

My home manual I picked up at Lehmans, an old style cast iron wheel type.  Its quite functional and very decorative.  

I didn't see one on their site but found this which is very similar.........Wheel Coffee Grinder

You control the grit by the tension from the other side.  You can do course for a percolator to fine for a drip.  Percolators come in handy when the powers off and quite frankly I often wonder why we ever went to drip makers.  

Tj

All coffee loses flavor from boiling without replenishing the coffee filtering.  A percolator is about the only device that can offer continuing filtering.  In other words, you can filter until a flavor content you desire, after you take coffee out, either add more water to keep the perking going waiting each time longer or adding new grinds to old to shorten the process.  It takes some skill even on a controlled heat source, but you can literally keep a consistent pot going all day long at the flavor level you want.  The control point is not just how much coffee but how often it perks.

A French press, now giving away to Expresso machines are basically the same process.  They use pressure to take as much flavor out of the grind as possible and the strength, though typically stronger than say a drip maker and besides bean selection, dependent on how much grind.  

Drip makers on the other hand, are a one shot deal totally dependent on grind texture and grind amount.  

Now here's one of the catch 22s.  The more of the flavor you take from the bean, the faster the coffee will bitter over time.  This is a big reason drip makers are so popular.  They don't make it that strong to begin with.  Its also why French Presses and Expresso machines tend to be very small or very specific on how much coffee they make.  Perkolators on the other hand vary in size to the very large old commercial makes (man that was good stuff) and though quality control more difficult can be maintained consistently over time.  Naturally, none of these stronger methods include sitting in a pot warming.  

Sorry, I got off a bit.  I am a tad into coffee.

Tj  

Without a doubt percolator is a lot more complicated than a drip maker.  Consistency however is in the experience of the operator and like a French Press or Expresso machine you can get a lot stronger cup of coffee and more bang for your buck per ounce of coffee.  

About the easiest make shift coffee maker is a plastic cup, pop a few holes in the bottom, and use the same filter paper you use in your drip maker.  Simply put the cup over your coffee cup and pour boiling water.  

About $5, you can buy the backpack one cup models which premeasure the coffee for you and have a reusable silk screen.  I have one of these in my back pack.

I just don't do instant.

Tj