Lime Juice
While tart like Lemon Juice, Lime Juice has a distinctly different flavor. In most cases, you can use these two interchangeably, but note that the resultant cocktail will taste different. You should always make every possible attempt to use freshly squeezed lemon juice, it does make a difference.

It is often easiest to prepare ahead of time the quantity of lemon juice you expect to use during the evening and store this in a glass container that you either keep refrigerated or resting on ice.

You should never confuse "Rose's Lime Juice" as a valid substitute for fresh squeezed lime juice in any recipe.