I have a four part question. 1. Has anyone used usual liquids for rebatching; such as tomato juice, lemon juice? 2. Would I need to add anything as preservative? 3. If I add goat milk for rebatching would it cause the soap to go rancid? 4. Would the benefical goodness of these liquids be any better by adding them to a rebatch rather than adding them to a CP batch?