If the dry skin is just the result of the fast I wouldn't worry too much about it, so long as you are drinking and don't feel thirsty. It could be a result of having the bouillon or even the vitamin tablets. Also having the Sugar tablets and the bouillon may actually be increasing your desire for other tastes, so abstaining from everything but water may get rid of your cravings as well.
I personally would not take either the vitamins or the bouillon. I trust both that the fasting works far better on it's own without any assistance and that refeeding on raw foods will build up your system better than anything unnatural. But I am not a doctor and I wouldn't advise against what one has told you, only tell you what I would do.