Yes for acceleration like that, its almost always the fragrance oil, or sometimes floral EO's. Unless of course you are soaping with stearic acid, then its the stearic acid.
I've used tap water for my soaps, it works, but distilled is better. Anything closer to distilled is better.
I've used tap water for my soaps, it works, but distilled is better. Anything closer to distilled is better.