Cola-flavored extracts aren't necessary for cola flavor. After all, those extracts originally started as real ingredients, so why not go right to the source? This formula yields a beautiful cola concoction using all fresh and dried ingredients, readily available in most home refrigerators and spice cupboards. The one ingredient you might have to search for is gum arabic. It's there for mouthfeel rather than flavor, so if you don't have it, your cola will still be delicious; it will just seem…