Add the pecan-infused bourbon, rye whiskey, maple syrup, aromatic bitters, and filtered water to a large measuring cup or directly into a bottle that seals well.
Stir until everything is fully combined.
Seal the bottle and place in the freezer for at least 6 hours to chill.
To serve, pour straight from the freezer into a rocks glass over a large cube.
Garnish with a pecan or cinnamon stick.