1. Strain bacon drippings into bourbon in a carafe or other pitcher. Let stand 8 hours.
2. Chill the bacon-infused bourbon until fat rises to the top; skim fat.
3. For each cocktail, pour 1/4 cup bacon-infused bourbon into an old-fashioned glass filled with desired amount of ice; stir in 1 tablespoon maple syrup and 1/8 teaspoons bitters. Garnish, if desired.