I enjoy a cup or two of coffee every day, but on hot day drinking hot coffee just does not seem so tempting.
When I lived alone I found it difficult to make just one cup of coffee, so I always had some coffee left. After allways having trouble throwing away the excess coffee I tried freezing it and it turned out to be a real good idea. What I do is that I make espresso, you could also make very strong regular coffee, and then I pour it into an icecube tray.
I put the icecube tray containing the coffee in the freezer and wait for a few hours or longer. Once it's frozen I pour a glass almost full of milk and then I add few coffee ice cubes in.
When the coffee cubes start to melt the coffee stays on the top part of the milk glass and when you drink it in a good pace you will allways have a good amount of coffee with your milk. I don't use any sugar with my ice coffee, I think the milk itself is sweet enough, but you could, or if you have some flavoured syrup you could use that.