Doesn't have to be healthy. Can be full of junk. I need it to be delicious and something that can be made a day or two in advance without effecting the taste. TIA
When I'm trying to be healthy, I'll just pour the concentrate over a glass of ice.
But to make it really yummy, the key is store bought syrup! I like the Torani ones. One squeeze of the syrup will make your iced coffee taste store-bought.