Whole Coffee Beans
Even bad beans are better when freshly ground.
Ground coffee quickly loses its flavor
After filling my Kitchenaid Glass grinder the rest of the whole beans are kept in a zip lock bag in the freezer until needed
A pinch of kosher salt sprinkled atop the grounds before brewing
The salt mellows any bitterness
A Flask to keep coffee hot and mellow
I use the above Ikea Flask.
It's inexpensive ($8) and keeps coffee heated all day