Frozen coffee, like a frappuccino? Or iced coffee? Fraps you can't make at home because there's prepackaged ingredients. Iced coffee you can do one of 2 ways: make regular strength coffee and put it in the fridge overnight, or make extra strong coffee and dilute it with ice. I use about 1 1/2 times the amount of ground coffee (or more, I like it really strong) then mix equal parts ice and coffee to cool it down. Then I either stick it in the fridge for later or pour the cooled coffee over more ice becuase I like to drink it way cold.