I am usually not a big fan of mocktails! Really - come to a bar and drink some proper drinks - or just drink water, a soft drink or orange juice [please spare me, with something like watermelon juice or kiwi juice!].
However being a beverage manager of a resort, also included "creative" introductions of alcohol free drinks - and especially in family restaurants, you will sell a lot!
So - as you can see on the picture, these are a quite evolutionary type of drink!
Basically it is an instant soda pop. You muddle your fruit and/or herb [you can add also some syrups like elderflower or vanilla] - you fill the glass with ice and fill it up with a neutral soda pop base.
This contains water, sugar, citric acid, carbon dioxide, a small pinch of salt and a small pinch of bicarbonate of soda.
I actually realized, that adding a bit salt and bicarbonate really boost the flavors and make the "pop" sing!
I am using Soda Plus, to carbonate the soda base - but you could also use a different system, which allows to carbonate flavored [and sweetened] beverages.
And yes - the Kahuna on the picture told me: we can also add a shot of alcohol to them, if a guest wants.... TRUE!