Preheat oven to 350 degrees F. Move oven rack to the lowest position.
In a medium bowl, mix together angel food cake mix and water using an electric mixer on low speed for 30 seconds. Increase speed to medium and mix 2 minutes.
Pour cake batter into ungreased 10x4" tube pan (preferably with removable bottom.)
Bake 37-47 minutes until the top is dark golden brown and cracks are dry.
Remove cake from oven and turn upside down to cool. (I place my cake pan upside down on top of soup cans.)
When cool, run a knife around the inside of the cake pan then remove the cake to a serving plate.
In a small bowl, combine frosting mix and boiling water. Beat on low speed for 30 seconds. Increase speed to high and whip frosting for 5-7 minutes, until stiff peaks form.
Spread frosting over completely cool cake. Serve immediately.