Not only water, even tzir. Water was written in order to exclude the case where only forbidden blood was in the vessel thereby forbidding the meat until a klipah is removed.
 Even if some liquid was in the vessel, the meat is still permitted because it was there for a short period of time, however if tzir was in the vessel, the meat is immediately forbidden.
 What is meant is that since the vessel is clean it won’t matter if it is treif or dairy even if there is presently no water in the vessel. However, if the vessel is dirty the meat would be forbidden unless there was at least a little water in the vessel. It seems from the Rema that all this is true even if the vessel is a ben-yomo. because salt won’t bring out absorbed taste.