The still water texture in Snapshot 14w25a is broken. For whatever reason, it looks like Polished Diorite. I have even tried enabling a resource pack, and that didn't help. Flowing water is fine, its just the still water. Screenshot attached. Screenshot helps describe the problem.
Duplicate of MC-56858 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.