I would suggest not taking the vitamins. It taxes your body to digest and assymilate them. You need all of your body focused on detoxing, that would just distract from it.
Also my very first fast was a five day water fast. I thought about doing other things first, but this is what made the most sense to me.
I wouldn't start now that you have already started, besides you are going to be hungry no matter what kind of fast that you do.