You will need grounds for this recipe. You don’t want to use grounds that are too fine. A coarse grind is best for easier filtering plus it will keep your coffee from becoming too acidic. Some say you should always grind your own coffee beans, others say store-bought is fine. It is really up to you. As for what kind of coffee, well, that is more of a personal thing. You could use something like Folgers or you could use a specialty shop grind or even espresso.