Cold brew coffee

We just found out about cold brew coffee from Whole Foods Market! The coffee is really concentrated, so you dilute it down with water or milk to yield a nice, smooth drink. Yum! I don't normally drink coffee because I'm very sensitive to caffeine, but this didn't make me jittery at all. Kept me awake though, on the car ride to Monterey a few weeks ago.
So we are trying to make our own cold brew using ground Philz coffee beans. Our first experiment will be with my boyfriend's favorite flavor, Tesora, a medium roast.

Here are the ingredients:
1. French press
2. Ground coffee (we will be trying coarsely ground beans this time, hopefully we don't have to use an additional coffee filter)
3. Water @ room temperature (3 parts water to 1 part coffee beans) --> we boiled our filtered water first to kill off any bacteria (I'm a microbiologist after all, careful as always)

Instructions:
1. Add water to ground coffee inside the French press. Stir as you add the water (This moistens the beans to ensure an even brew)
2. Cover the French press with the lid placed lightly on (do not press down!), or use clingwrap to cover the top of the pot.
3. Leave overnight, or for 12 hours, in the fridge.

To enjoy, add one part milk or water to one part coffee concentrate!

UPDATE: We left our beans in the water for 12 hours, and it was great! Despite grinding the beans coarsely, there were still some particles in the coffee from the French press. To yield the nice smooth texture, we still have to use a coffee filter!