If you feel you need to eat, then drop the idea of SS and go for 790 instead. That way you can eat food everyday, although what you can have is limited.
Eating whilst in SS means you will keep kicking yourself out of ketosis. The food you take in will replenish the glycogen stores, and cause you to retain water, and you will see significant upward weight changes. Really not worth it, either for the unnecessary punishment it puts the body through nor the mental torture of your weight going up and down.
True, there are things you can eat that would not do this to you, but if you are planning on being that careful each time, you may as well do it officially and do 790.