Better water.
The Barista Institute states that a cup of coffee is 98% water, so high-quality water will make a better cup o' Joe. This means water you use to brew can impact flavor in a big way. Filtering water of chlorine, odors, and flavors is recommended when making your coffee as these impact the flavor profile even after your water is heated and brewed.
Now that you've put time and care in brewing your prefect cup of coffee with crisp, clean water you might want to consider what you drink out of, too. The mug or cup you use can also impact the flavor of your coffee. Drinking out of a solid, neutral material, like ceramic or porcelain, will help retain it's purest flavor.
Let us know your recommendations for making your best cup of coffee on our Soma Crew page.