Substitutes:

• Rum: I've used whiskey as a substitute if I run out of rum. It changes the flavor profile but still pairs well with cola and lime.
• Cola: I've used ginger ale or lemon-lime soda in a pinch. The taste is different but still refreshing.
• Lime: Bottled lime juice can work if fresh limes aren't available. Just be cautious with the amount; it's often more concentrated.

Making a Pitcher:

• Scale: To make a pitcher that serves 8, multiply all the ingredients by 8. That would be 16 oz of rum, 32 oz of cola, and 4 oz of lime juice.
• Mix: In a large pitcher, combine the rum, freshly squeezed lime juice, and cola. Stir well.
• Serve: Pour the mixture into ice-filled highball glasses, garnish with a lime wedge, and serve immediately.

Making it Non-Alcoholic:

• Rum Substitute: Use a non-alcoholic rum substitute or even coconut water for a tropical twist.
• Proceed As Usual: Use these non-alcoholic substitutes instead of the regular ingredients, follow the original steps, and enjoy a non-alcoholic version of the cocktail.

Making it Vegan:

• Cola: Most mainstream colas are already vegan, but it's always good to check the label for any animal-derived ingredients.
• Lime: No issues here; lime is naturally vegan.
• Rum: Most rums are vegan, but some premium rums might use animal-derived products in their filtration process. Always check the label or the manufacturer's website to be sure.