They are double-sided, single-serve Cuisinart machines that use small filter pack pods -- round and a little larger than a tea bag. I DIY it by bringing my own "pods" from home. I just fold a coffee filter around a Tablespoon or two of my favorite ground coffee -- if you don't know how to do an origami-style fold that will stay secure, you could tie it with butcher's twine or string from a tea bag. I keep each one in a snack-sized Ziploc bag with all the air squeezed out, so it stays as fresh as possible until I'm ready to use it.
