Preheat oven to 350°. Whisk together eggs, sugar, pumpkin, oil and water. In another bowl, combine flour, cinnamon, baking soda, baking powder and salt. Stir into pumpkin mixture; mix well. Fold in nuts. Fill greased or paper-lined muffin cups three-fourths full.
Bake until a toothpick inserted in center comes out clean, 20-25 minutes (do not overbake). Cool on wire rack.