Ok, so we do need Starbucks a little since we got the coffee beans from them (Sumatra Dark Roast) and had them grind them. But you can get that lots of places.
We basically followed the directions for this "Home Brew" but we did not use mason jars. Also, we were lazy and just used the a filter rather than multiple paper ones. Worked fine (we told the barista that's what we'd be using so he set the grinder to the right setting) and it took more like 5 minutes to strain the concentrate, rather than an hour.