The poster said: ...just coffee itself, not a flavor added.
I started grinding whole coffee beans when it was reported many of the ground coffees have a lot of filler ground up with it from pecan shells to dirt. We use a Keurig and using the fill your own cups works just fine. No waste of coffee making one cup when wanted. I like Starbucks whole beans and 8 O'clock whole beans. I grind enough to last a week at a time.