Mix cake mix, sour cream, vegetable oil, sugar, water and eggs together on low with an electric mixer. Turn the mixer to medium speed and beat for two minutes.
Caramel Icing
Combine sugar, milk, and butter in a saucepan. Bring to a boil.
Brown 1/2 cup sugar in a skillet. Cook, stirring constantly until sugar melts and the syrup is light, golden brown.
Add sugar to the milk mixture. When the mixture reaches the soft ball stage. Beat with an electric mixer until the mixture reaches spreading consistency Spread quickly over the cooled cake layers.