For an extra burst of flavor, try using flavored soda water, such as lemon or basil-infused. Adjust the amount of ice to your preference. More ice will result in a colder, more diluted cocktail. If you don't have a cocktail shaker, you can use a mason jar with a tight-fitting lid. The quality of your limoncello will greatly impact the taste of the cocktail. Opt for a high-quality brand for the best results.