Before I get to my thoughts thank you for the help.
Okay; Thaliessen Blood is added to my list. Why does the fluff mention elves and half elves if the feat is half elves only?
I forgot about HotEC when checking my material for this stuff. Monks get some water powers there, and there's some stuff that can combine with storm/ice effects across other books to work for sorcerers and wizards. Annoyed I forgot, and somewhat impressed it still doesn't give a prestige class focusing on water.
I suppose the silver lining is that I can write homebrew material with minimal overlap.