This is supposed to be a concentrate, so you add water. It says 1:1 ratio, but I just add a little and sometimes a little cream. I like it stronger. I also just use Starbuck's beans since I would typically get their cold brew. I've been told Starbucks and Caribou will do a rough grind of their beans for you instore too. The video below shows how I make mine. I'm linking a cold brew machine a lot of people recommended too. I haven't tried it, but I got SO many messages about the Toddy, so I figured I'd share.
Also, this is the glass cup I ordered. I will link it here!