I only found this: http://www.nexusmods.com/newvegas/mods/54775/?
In my opinion however I don't think it's of the highest quality. I don't really think there are any high quality water mods for new vegas due to the very small amount you encounter. I believe there was a pure waters mod for fallout 3 like the one for skyrim, which might work in new vegas but I'm not 100% on that.
Good luck sir.