First, make half a cup of coffee with boiling water. This can be made sugar-free, with or without sugar, to taste, if desired. You can also get more coffee flavor, especially by making coffee with the help of a French press or a paper filter.
Now refrigerate it.
Then put ice in a tall glass and pour coffee, milk, and vanilla extract over it.
Now spoon well and mix well. Mix the ingredients according to the desired taste.