Substitutes:

• Irish Whiskey: If you don't have Irish whiskey, try using bourbon for a slightly sweeter taste. I've also used rye whiskey for a spicier kick.
• Melon Liqueur: If you are out of  Melon liqueur, opt for a peach liquor instead, for a different fruity twist.
• Blue Curaçao: Triple sec with a drop of blue food coloring works in a pinch, though it won't have the same vibrant hue.
• Pineapple Juice: Freshly squeezed orange juice can replace pineapple juice for a citrusy twist.

Making a Pitcher of Drunk Leprechaun:

• Scale: To make a pitcher that serves 8, multiply all the ingredients by 8. That would be 8 oz of Irish whiskey, 8 oz of melon liqueur, 8 oz of blue curaçao, and 16 oz of pineapple juice.
• Mix: In a large pitcher, combine the whiskey, melon liqueur, blue curaçao, and pineapple juice. Stir well.
• Serve: Pour the mixture into individual ice-filled highball glasses, garnish with a pineapple slice or cherry, and serve immediately.

Making it Non-Alcoholic:

• Whiskey Substitute: Use non-alcoholic whiskey alternatives available in stores; they mimic the flavor without the alcohol content.
• Liqueur Substitutes: For melon liqueur and blue curaçao, use flavored syrups like melon syrup and blue curaçao syrup to maintain sweetness and color.
• Proceed As Usual: Replace alcoholic ingredients with these substitutes and follow the original steps for a non-alcoholic version.