Make sure that you add a proper amount of coffee first, it won't hurt to add too much as you can dilute the coffee later, but if you add too little then I afraid that the coffee is irreparable. Chances are you also grind the coffee improperly: grind too coarse and the full flavor is not exacted fully, but grind too fine and you might overbrew and the coffee would absorb acid and nasty-tasting chemicals. The same thing goes with temperature: too cold and you would underextract and make the coffee watery, and too hot and the coffee would be bitter The coffee beans' and water quality also make a small difference in how tasty the coffee would be. Specifically, natural drinkable water has a level of mineral ions (calcium, magnesium, etc.) that usually won't affect coffee's taste that much, but make sure that the mineral level isn't too high or else the coffee would taste bitter, sour or just plain bad.
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