Watergate Cake

350 degrees

1 2-layer white cake mix

1 package pistachio instant pudding

1 cup 7-up

1/4 cup oil (looks like the recipe initially said 1/2 but has been corrected)

3 eggs

a few drops green food coloring

Frosting

1 1/2 cup milk

1 package dream whip

1 package instant pudding