I typically use any type of coffee that I can get my hands on, but the stronger the coffee the better for this. I like the Cafe Bustelo espresso. This makes a very strong coffee, almost a coffee concentrate. I often water it down a little or add extra milk. I use just a cheap gallon pitcher and a brick of the espresso. You can find it at Target for a little less than $4 or on Amazon (click here) for even less!
I fill my pitcher with filtered water, add the brick of espresso, stir, let sit over night. In the morning I use my coffee strainer (found this at my local Asian market) to filter out the grounds and store the coffee in large mason jars. I add sugar free creamer for Lan and regular sweet cream creamer for myself. YUM! Making the coffee cold brew style eliminates a lot of acidity. I am not a fan of sour coffee so I love this method.