Preheat oven to 350 degrees F. In a bowl use an electric mixer to incorporate necessary water into powdered mix until light, fluffy and incorporated.
Use a spatula to gently fold in the cocoa powder, sprinkling in a little at a time.
Pour batter into ungreased tube pan. Move oven rack to bottom and set in the middle.
Bake for 40-45 minutes until top is not sticky and springs back when gently touched in center.
Remove and sit pan upside down on a cooling rack or with bottle in the middle until cooled. Run a knife around the pan to remove the sides. Loosen bottom of the pan and middle to remove the whole thing.