Refrigerating coffee will help preserve its flavor. You can keep coffee in the fridge for up to a week. While you can reheat cold coffee, you'll get the best flavor by enjoying it chilled. If you'd like your brewed coffee to last even longer, you can freeze it in an airtight container and keep it for up to two months. You can also try making ice cubes from coffee. Add these to your refrigerated coffee for an iced coffee that won't get diluted as the cubes melt.