Step 1 with an automatic drip coffee maker is: throw away any coffee scoops that came with the coffee maker. Measuring coffee by volume will always yield inconsistent results as different roasts will result in different densities of finished products both from the same bean and from different beans. Measuring coffee should always be done with a scale. This brings us to step 2: measure how much water your drip machine is brewing. Either weigh or measure by volume the amount of water your decanter holds to the “4 cup” mark or the “6 cup” mark and write down the results. Once you figure this out, you can then use the formula of 65 grams of coffee per liter of water (1.83 grams per volume ounce of water) to determine how much coffee to use.
If you are brewing 1 liter of water, start with 65 grams. If you are brewing 1/2 a liter, start with 33 grams. Then grind your coffee to a medium coarseness (many paragraphs could be typed here about grind quality) and place into a new drip filter (gold reusable or paper filter). Press the start button. If your coffee brews into a thermal carafe, drink at your leisure. If your coffeemaker has a heating element underneath the carafe, pour your coffee into a preheated thermos of some variety so that your coffee isn’t slowly cooked down to a thickened coffee sauce.
If the coffee tastes perfect, note your ratios and reuse. If your coffee tastes either too weak, increase the amount of coffee you used. If your coffee is too strong for your taste, decrease the amount of coffee. If your coffee was the correct strength but it tasted too bitter, try grinding slightly coarser. If the coffee was the correct strength but to sour, try grinding slightly finer. These general guidelines should help you to achieve repeatable results.