Yeah, I kinda laugh at those frozen drink mixes.
Fresh is best!
I don't make a traditional Mojito though, as I have a couple additions I make.
I make a simple syrup infused with mint (which I then strain out after).
My light rum I keep in the freezer.
Lime juice is fresh squeezed of course.
Then I use a carbonated mineral water like Pellegrino which lacks the sterile taste of most seltzers. It's kept in the coldest part of the 'fridge.
I roll two mint leaves between my thumb and index finger to bring the oils out. Then they go in the bottom of a tall glass. Next, a few ice cubes. Then the fluids... 1fl.oz. Lime Juice, 1.5fl.oz. "freezer" rum (sometimes 2fl.oz.), 1.5fl.oz. Mint Infused Simple Syrup (sometimes 2fl.oz.), and then 3fl.oz. or so of Pellegrino. Lime twist on the rim.
Actually drank a few of these Saturday sitting on my friends front porch along with some tortilla chips and a salad. Then she'll make White Russians with melted Vanilla Bean Haagen Daaz, and it's all downhill from there... (especially after a couple bottles of sweet red wine come out as the sun burns the horizon)
I love summer.