Grease or spray a 9 x 5-inch loaf pan. Preheat oven to 350℉. Pour contents of mix packet into mixing bowl and add melted butter, water, eggs and nuts, if desired. Mix thoroughly. Pour batter into prepared pan. Bake 50 - 55 minutes, or until a toothpick inserted into the center of the loaf comes out clean. Remove pan and allow to cool 10 minutes on a cooling rack. Remove loaf from pan and allow to cool completely before slicing.