In a mixing bowl, combine entire amount of bread mix and a 12 oz. can of beer (warm or cold) OR 12 oz. (1-1/2 cups) club soda.  Stir until well blended.  Pour into a 9" x 5" greased loaf pan.  Melt 1/4 cup margarine and pour over top of bread batter. Bake at 350 degrees for approx. 1 hour.