Just add coarse-ground coffee into the mesh filter, pour water into the pitcher, screw the lid on (with the filter attached and submerged in the water), let it brew for 12–24 hours, and serve. You can pour it straight over ice cubes, or cut it with water or milk. Read our Tayeka cold brew maker review!
Promising review: "I love this thing so much! I use it every day. I bought it over a year ago — still love it, has held up perfectly, and looks brand new! It is easy to clean, durable, well-sealed, and high quality! Making coffee this way provides richer flavor profiles and notes. It also allows you to make a coffee ahead of time. If you can't make a lot of noise, let's say early in the morning, this allows you to have coffee ready and pre-made. If you like iced, cold, pre-made, or richer profile coffee, I highly recommend this coffee maker pitcher. I am actually thankful for it every time I use it! :0)" —EBG
Get it from Amazon for $19.99+ (available in two sizes and in three colors).