Substitutes:

• Bourbon: If you don't have bourbon, rye whiskey or brandy can be substituted. They offer a different flavor profile but still work well in this cocktail.
• Simple Syrup: Honey or agave nectar can be used as natural sweeteners if you're out of simple syrup. Just remember to adjust the quantity to taste as they are sweeter than simple syrup.
• Lemon: If you're out of lemons, use limes for a different citrus twist.

Making a Pitcher of Bourbon Smash:

• Scale: To make a pitcher that serves 8, multiply all the ingredients by 8. That would be 16 oz of bourbon, 8 oz of simple syrup, 4 lemons cut into wedges, and 32 fresh mint leaves.
• Mix: Muddle the lemon wedges in a large pitcher. Tap the mint leaves to release the aroma, before dropping them into the pitcher. Add the bourbon and simple syrup, then stir well.
• Serve: Pour the mixture into individual ice-filled Old Fashioned glasses, garnish with a mint sprig and lemon wheel, and serve immediately.

Making it Non-Alcoholic:

• Bourbon Substitute: Use a non-alcoholic bourbon substitute; these are available in the market and do an excellent job of mimicking bourbon's flavor.
• Proceed As Usual: Use this non-alcoholic substitute instead of regular bourbon, follow the original steps, and enjoy a non-alcoholic version.

Making it Vegan:

• Simple Syrup Substitute: Ensure your simple syrup is made with sugar that doesn't involve animal products in its production, or use agave nectar as a substitute.
• Proceed As Usual: With this vegan-friendly sweetener, follow the original steps to enjoy a delicious vegan Bourbon Smash.