If you are making a rich fruit cake, brandy is the only booze that will ensure the cake will keep for a long time. Any booze can be used, but its brandy that will ensure a long life. Can you not buy a little bottle, like you get on airplanes? They often sell them in large bottleshops. I personally wouldn't try beer, the brandy makes them taste fabulous, anything else wouldnt be the same. cheers.