There are three ways I know of, your americano on ice method, the brew cold overnight method, and their method.

All three produce varying acidity levels of the same horrible drink, IMO. Most people I see drinking iced coffee either A. drown it in sweeteners and cream, or B. just slam it down black for the fastest caffeine intake on a hot day.

I'm sure many people disagree with me, but I've tried it in probably every form there is, and it's just a waste of coffee to me.