Jan 6 '16 at 10:34, by
BESW @eimyr Quick and dirty: Put cheap coffee grounds and water in a pitcher. Leave it in the back of the 'fridge for 24 hours. Filter the grounds out. Enjoy. (I do about 7 heaping spoon of grounds in three cups of water, but it's an art not a science. Experiment. Changing the time can also give you different strengths, but under 12 is useless and over 48 is nasty.)