With the muggy days of summer doing their best job of smothering us, there’s nothing better than a big mug of cold beer at the end of a long work day. This is why the best bars bring out a big mug covered in cold, frosty, goodness. It seems like the coldness has a refreshing element all by itself. Restaurants often use mug chilling devices to serve beer at the perfect level of frostiness. But there are cheaper, simpler ways to make your own ice cold mugs.