Yeah. Although I have to note my above post is simplified, so don't give too much attention to it. In theory you could foresee if somebody is going to kill you, if you are in control of time. However, that would require you to be doing it constantly, because if you avoided one attempt, another might appear that obviously wouldn't have taken place if the first had succeeded. I can tell such a power would render one paranoid...
I haven't listened carefully enough to the Japanese lines to know if they are always speaking about sea water or water in general, but in the subtitles they just say devil's fruit users are hammers in water (well, I'm pretty sure that's what they are saying). Seawater is just water with a few percent salt. I doubt that the salt is what makes the difference... It's just that in a world with so many oceans and seas sea water is common and easiest to fall into.Originally Posted by AssertnFailure
And I don't think there has been any water fruits in the series or the movies. There was one liquid fruit user chick, though, in a movie, but that's a bit different. Water fruit, I believe, would be a clear oxymoron, and thus I don't think we will ever see one. If you turned your body into water, you would nullify your own power instantly.