Decide how many servings of the original recipe you want to make.
Calculate how much of each ingredient you'll need (including the water for dilution).
Start by adding the liquor to a large container.
Then the more flavorful ingreidnets (like bitters, citrus, etc.)
Add the water for dilution.
If using, add the bubbles right before serving.
Taste the big batch cocktail and adjust the ingredients as needed.
Store in the refrigerator before serving!