This really depends on how you are presenting yourself, and who your customers are... for plain, simple and natural, Euphoria wins hands down, so that was what I voted for.
Ruthie, to me, looks like it is designed for the high end crowd... the same people that seem to follow each of the new health trends, which seem to change weekly, and will pay extra for ingredients they have heard about recently, whether that be 'acai', 'pomegranate', 'jojoba', etc.
Uglyqua looks old fashioned to me.. the type of typeface you would see in a turn of the century (or even earlier) periodical. As for soaps, this makes me think of the old style signage like this -->
http://wholesale-prints.net/MBB0887/MBB0887443L.jpg
Water Street looks like what you might end up with if a modern Celtic-ish font had an illegitimate love-child with Russian Cyrillic. Of the fonts you present, it looks both the most confused, and the most confusing. I have a feeling you were going for the Celtic feel with it, but if that is the case, i would go with something like -->
http://www.dafont.com/stonehenge.font or
http://www.dafont.com/irishuncialfabeta.font (although the 'g' is hard to read) or
http://www.dafont.com/stonecross.font or
http://www.dafont.com/carolingia.font.
Personally, I feel it really depends on where you will sell the bulk of your soaps:
Craft Fairs: Uphoria
Health Spas, high end boutiques: Ruthie
Dime Stores, Flea Markets: Uglyqua
Renaissance Festivals: Some Celtic font other than Water Street.