Preheat the oven to 180 C (350 F). Grease and flour a 12 cup bundt cake pan.
In a large bowl, stir together cake mix, pudding mix, sour cream, vegetable oil, eggs and water until well combined.
Stir in the chocolate chips, then transfer batter to prepared pan.
Bake for 50-55 minutes until cake top is springy to touch, and toothpick comes out clean (or mostly clean, the chocolate chips might show melted chocolate on the toothpick)
Cool in pan for at least one hour, then invert onto serving plate and top with the chocolate glaze or sprinkle some icing sugar on top.