Heat oven to 400°F. Line muffin pan with paper baking cups.
Stir together water, oil, eggs, berries and Krusteaz Banana Nut Muffin Mix until moistened. Fill muffin cups 2/3 full.
Bake 16-18 minutes or 18-20 minutes if using frozen berries. Cool 5 minutes; gently loosen and remove from pan. Store cooled muffins in tightly covered container.