Phil is right--start with the best coffee
But that's only half the story...the other half is in knowing how to make it. If you don't use a percolator, all other methods--drip coffee makers, Melita, French press, or even the bags--are just different approaches to infusion...and the secret to good coffee using infusion is no different from what it takes to make a really good cup of tea (which most Americans don't know how make either...I was taught by an English friend): the water must be BOILING, not just hot when it's poured over the coffee...the filter and the pot or cup must be covered to keep the steam and the flavor in--a process known as "steeping"...and it must be allowed to steep long enough for the full flavor to develop. That's why the Melita filter produces a better cup of coffee than most other methods...it covers the top of the cup or the pot (depending upon which one you use. Covering the top of the filter while it drips improves it even more...and waiting a couple of minutes after it's finished dripping before removing the cover improves it even more. Same is true for a French press...use only boiling water, and let it steep long enough for the flavor to develop. Even those gawdawful coffee "tea bags" can produce a decent cup of coffee, IF--instead of just dunking it up and down in a cup of reasonably hot water till the water turns brown enough--which makes DREADFUL coffee!<gak>--you pour only BOILING water over it and then immediately cover the cup for several minutes. And btw...you can make your own "coffee bags" by just putting some GOOD coffee--very finely ground--in a coffee filter and sealing it with a twist tie...drop it in the cup, pour boiling water over it, cover the cup...fish it out with a spoon. You can even use a paper towel in a crunch--I've used a paper towel as a filter in the Mr. Coffee when I've run out.Unless you go through a bag of coffee in a week, keep your coffee in the freezer, in a sealed zip lock, till you're ready to use it. The oils in coffee evaporate at room temperature and it starts to lose flavor almost as soon as it's been ground. Better yet, buy beans, keep those in the freezer, tightly sealed...grind 'em yourself--and only grind what you'll use in a few days. If you can't keep coffee--whole beans or ground--in the freezer, keep it in an airtight container. You'll be amazed at how much better your coffee will taste after you've had it a while.