I make my own iced coffee, it’s cheaper and you control what goes in it, for us it’s:
500ml Milk (low fat, no fat, full cream, your choice)
2 teaspoons instant coffee. (I don’t use brewed coffee but I guess you can use it)
3 teaspoons of sugar.
In a jug pour a tablespoon or 2 of boiling water over sugar and coffee to dissolve it a little. Add milk and shake in the lidded shaker or stir/whisk very well in a jug. Chill in fridge.
This is enough for 2 glasses, if you wish to top with whipped cream and sprinkle on chocolate, go for it.
Iced coffee can also be added to a chocolate cake mix instead of plain milk for that mocha flavour.
Add more coffee if you want a stronger flavour or more sugar for sweetness.