Yes moxsie,
the skin is an organ of elimination too, so skin eruptions can be quite common while water fasting.
Fuhrmans Eat To Live food plan is mainly plant-based: in fact he insists that his Heart patients who can undergo a water fast, must live on this diet to improve their health and lose excess weight pre-fast, avoiding the need for open-heart and by-pass surgery in many many cases.
The amount of time between terminating your fast and your next fast, is directly in proportion to the length of the fast. It has been said that a fast of say 20 days should be followed by a re-feeding plan of the same length of days at least, but (in my own opinion) I would normally add on at least another week just to make sure that any depleted food reserves are sufficiently replenished. Others may disagree, but that is my experience.