Below are a few key things that will affect your coffee no matter the brewing method.
FRESH COFFEE - Be sure to buy freshly roasted coffee beans. Coffee is like any other perishable product and will lose freshness over time and become stale. Ideally you should consume your coffee 3 - 45 days after it’s roasted. 45 days might seem long, but if stored in an air tight container (at room temp) it should last just fine!
GRIND - If you can, invest in a good conical burr grinder. This will ensure an even grind and increase consistency. It will also allow you to adjust the coarseness of the grind which will vary depending on your brewing method. Additionally, grind your beans just before you brew. This is important because coffee begins to go stale as soon as it’s ground.
PURIFIED WATER - Your coffee is 98% water and if the water has a flavor it can greatly affect the taste of your coffee. It’s also important to use water that’s not quite boiling; 195-205 deg F is ideal. Boiling water can scorch the grounds, bring out the bitterness and affect the flavor. If you don't have a thermometer, bring your water to a boil, then let it rest for about 30 seconds before you use.
RATIOS - We prefer to brew our coffee with this ratio of 1:15 // coffee:water, meaning 1 part coffee to 15 parts water. If you don’t have a scale, a TBSP is about 6g of coffee. Note, there are 28 grams in 1 ounce. Play with your ratio to find a balance that suits your tastes!