this cake i made a 10" square one layer cake for the floor. covered it in fondant and made a tile pattern on the floor. for the tub i baked a 9x13 cake and cut out three oval shaped pieces. once i had those together i cut them to the shape of the tub. covered the tub with fondant. for the water i just mixed the gel icing with buttercream frosting to make it look like water.