Cold brew is a method of making coffee that results in lower acidity than traditional brewing methods. To make it, coffee grounds are steeped in cold water for 12-24 hours before straining. There are many tools on the market nowadays to help you make cold brew at home, from specialized cold brew coffee makers to the Toddy system and coffee socks. However, if I'm being honest, I usually just grab a jug of pre-made Stok or Starbucks cold brew from the refrigerated section of the grocery store!