Toddy has a cold brew container that makes the process really easy. It has a filter disc at the bottom. I ended up buying some reusable cotton filter bags since their paper filters were a bit expensive.
I use the 12 oz whole bag of coffee per batch and fill the toddy up with water to the top. It makes about two liters/quarts of coffee. I usually top up the pitcher I store the coffee in with a few ounces of water in an attempt to keep the concentration consistent between batches.