Sweet N Sour Blackberry Bourbon Drink

"We're about a month away from Halloween, and I'm over here fantasizing about all the cool party drinks I can concoct for this particular holiday! You've all shown a surprising enthusiasm for our holiday drinks and white sangria in the past, so I figured we may as well keep em coming. This Sweet Tarts drink can be made using stuff stolen from your kids' candy stash, so that gives it extra points. Right? Yeah, it totally does. This Sweet Tarts drink idea could totally be spun off into an entire party."