First you steal an immersion circulator...

I took the plunge and built an immersion circulator 
a couple of years ago. It was a fun project, neither too difficult nor expensive.

There are also inexpensive machines aimed at consumers which should easily handle drink related chores. The future looks bright too.

Truth be told, I haven't used mine a whole lot, but I can imagine a number of ways it might help make some cool drink ingredients.

Here are a couple of links to get you thinking:

• Old Fashioned
• Mulled Wine
• Eggnog
• How about Popcorn Infused Buttered Rum...

Thanks to Seattle Food Geek, for the circulator instructions.