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How to make refreshing cold coffee 
Know that pouring coffee over plain ice cubes often leads to watery, unappealing coffee. 
The reason why most coffee shops use cold brewing to make iced coffee is that it prevents your coffee from losing flavor to the ice. However, there are several ways to get delicious iced coffee without waiting 12 hours for a cold brew.
Brew your coffee double strength and pour it over a full glass of ice. The simplest way to get great tasting, refreshing cold coffee is to brew it twice as strong and let the ice dilute the coffee.