I buy Guatemalan beans at a coffee shop that will roast them for you. I get a light roast if I'm making hot coffee, but most of the time I get a medium roast for cold brew. I got a cold brew coffee tower and it's pretty great. If you're unfamiliar, A reservoir of cold water slowly drips into finely ground coffee and slowly seeps through to collect in a container. Adjusting the drip speed will alter the flavor slightly and brewing can take between 3 and 12 hours. I use 5 parts water to 1 part coffee by weight. The result is a less bitter slightly concentrated ice coffee. You can mix it with a little hot water for a nice cup, but I mostly drink it cold with only a bit of cream added.
That's the main way I cold brew. What tower do you use? I got the 1 liter one from Hario.
I'm not sure of the brand, it's a simple three sided wooden frame and all the glass is Gator Glass. It was the greatest coffee investment I've ever made!
That sounds really cool! Do you have a picture of it?
Here it is. I also saw some similar ones on Amazon for $200