Would a water manipulating Devil Fruit user be able to swim? If all Devil Fruit users in One Piece anime are not capable of swimming, what about a Devil Fruit user whose ability is to control water? Can such a person able to swim or evade the Devil Fruit's curse?
Most of this answer is speculation as there is currently no answer to this question.

I think that the possibility of the "Mizu Mizu no Mi" existing somewhere in the One Piece universe is highly possible, since we have already seen multiple states of water being Devil Fruits:


Moku Moku no Mi (Smoke - Gas state)*
Hie Hie no Mi (Ice - Solid state)
Yuki Yuki no Mi (Snow - Solid state)


* I know this one is disputable

The only problem with the "Mizu Mizu no Mi" is that it will create a paradox.
Since Devil Fruit users are weak to water, if a Devil Fruit user transforms into water, he would be rendered powerless and transform back to his normal form.

But all in all, I don't think the person using this Devil Fruit will be able to circumvent the "curse" Devil Fruit users get from eating them.