In a large bowl cream together margarine and sugar.

Add eggs, one at a time.

Add mashed bananas and water and beat until smooth.

In a separate bowl mix flour, baking powder, and baking soda.

Pour flour mix into wet mix and beat gently only until smooth.

Add walnuts and bake in a sprayed 9x5x3 pan. In a preheated 350 oven for an hour, or until a toothpick comes out clean.

To make muffins, pour into muffin pan lined with papers. Bake at 350 for 20 min.