Grandma Wavra's Berry Pudding Cake

This is a recipe from Jeff's grandma that has withstood the test of time. 

1 c. flour
2 tsp. baking powder
1/8 tsp. salt
¼ c. margarine
½ c. milk
        Combine first 3 ingredients. Cut in margarine. Add milk. Stir well. Place in greased 9x13 pan. Pour 1 pint to 1 quart of berries (logan, boysen, marion, black) over top. Sprinkle ½ c. sugar on top of that. Pour ½ c. water or juice over that. Bake at 325° for 40-45 minutes.