Smoked Peach Juice: Cut peaches in half, remove pits, and smoke at 250 degrees for 40 minutes. Combine smoked peaches, lemon juice, and honey in a blender and blend until smooth. Strain through a fine mesh strainer and store in the refrigerator for up to 3 days. To prepare a cocktail, fill a rocks glass with ice and add smoked peach juice and bourbon. Top with sparkling water, stir gently, and garnish with rosemary.