Take a cup and add instant coffee and sugar to it. Pour 1/2 cup of hot water and let it still till coffee and sugar dissolve and the mix come to the room temperature. To cut down on time, you can also place this dissolved mix of coffee in freezer for quick cooling.
Now add 1/2 cup of ice, coffee mix, 1 cup of chilled water and milk to the blender. Blend till it becomes frothy.
Fill the glasses with rest of the 1/2 cup of ice. Pour the iced coffee in the glasses. If desired, add a dollop of vanilla. Stir and drink.
Notes
You may use any brand of instant coffee. You may adjust the water and milk content to your liking but this is perfect for adult coffee dose. Do not give this to the kids please. You may also use any leftover coffee from your morning brew.