In her new book, Ina Garten gives the world her vanilla cold brew recipe and the kit she uses to make it: the CoffeeSock. .Upon introduction to this simple kit, Ina says she was "totally hooked.".Basically, the CoffeeSock is an organic cotton cloth bag designed to hold the coffee grounds as they steep.These reusable filters last for more than a year and are supposed to "out-perform any comparable" cold-brew competitors.The cotton bag allows more coffee bean oil and less acid into the water, so you won't get a harsh, bitter tinge.Instead, the CoffeeSock will produce the smooth result that is only found in coffee shops.It seems that Ina's famous catchphrase holds true yet again. When it comes to cold brew kits, "store-bought is fine." .You can get one on Amazon for only $17 right now