Real lime juice is definitely the way to go.
Juicing your own limes is the best choice, but not all of us have time to do that, so getting pure lime juice is a great choice.
Pouring the ingredients in the order given in the directions allows it to self-mix.
However, sometimes I like to give it a little stir so the ice chills it a bit quicker.
Everyone has a different preference.
It’s best to drink this immediately.
If not, the ice will melt and completely water it down.
So, this isn’t a great recipe for a make ahead option.