Preheat oven to 325 degrees. Line muffin tin with paper liners. (This recipe will make slightly more than 24 cupcakes). Pour cake mix into a large mixing bowl. Then add melted butter, eggs, pudding mix, mashed bananas, and water. Mix well. Use a large cookie scoop to place batter into the paper liners. Liners should be just over half-full. Bake for 18-24 minutes until cupcakes spring back when lightly touched. Cool completely on cooling racks.