I mostly think that any large container that can hold water is a cold brew maker. I used to use one of those large pitchers from the supermarket used for serving lemonade (really any sweet drink), but really any large container you have will work that you don’t mind having coffee leech in to.
Because all you really need is water and coffee grounds mixed together inside of something sitting anywhere for a long enough time. Nowadays I use a half gallon mason jar left sitting on my counter for 12-18 hours and then I filter
When I go filter, I filter out the bulk of the grounds using just a strainer. Then I use 2-3 coffee filter lined strainers over whatever bowls I have and let it drain
Or get a Toddy, they were recommended as well when I looked into cold brew