The Holy Grail of cocktail makers is a neat ice kit. With the Studio Neat neat ice kit you can make large blocks of crystal-clear ice for your bourbon/hard liquor, or perfect crushed ice for drinks for your crushed ice drinks like a mint julep.

This is a pretty cool kit, but you'll have to get on the waiting list to be ready to purchase when it's available for production. Here's the Kickstarter page that started it all, with the intro video and more information about the product.