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In addition to the following ingredients you will need jars for storing or gifting. You can pour some of the coffee liqueur back into the fifth bottle, use canning jars, or any variety of the Grolsch brand (or similar) bottle. I scored a dozen bottles at a homebrew shop while in college and they were inexpensive and well made. I love the rubber flange which ensures a great seal and mine have lasted 10 years without needing replacement. If I had to buy more bottles, I might get clear glass as it is fun to see the color of the concoction you are serving. They are available by clicking the photo below.
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Combine in a large saucepan:3 cups white sugar (I have used turbinado sugar and it was delicious also and contributed to the maple-y flavor to good effect)
12 tablespoons instant coffee
4 cups water