My daughter's othodontist has a Keurig in his waiting room with a vast selection of the little cups needed to make coffee in this pot.
Hygentist said that you can buy a special filter and use your own grounds.
I checked it out today at Bed Bath and Beyond and it is called "My K cup" and it was 14.99 You would just bring your own ground coffee.
Ebay also has several listed.
Bed bath and Beyond also sold the coffee pod cups that fit into the Keurig and there were many brands to choose from, Caribou, Newmans Own, Emerils, etc. They were all 9.99 for 18 little cups. So if you just wanted to bring extra cups you could.
I don't think it makes a very good cup of coffee in my opinion. It just has kind of an "instant" taste to it rather than strong brewed. Of course, coffee, I am very picky about. I am not a starbucks gal, but I did not care for the coffee out of the Keurig.