I do believe in flat earth but since the oceans should show some curvature due to the earth being as a globe, does water bend or is there evidence that it does bend?
Still water is always level. Moving water is generally NOT level.
The definition of level is, level is at right angles to down. On the surface of the earth, this means oceans follow the curvature of the earth. But oceans arent mostly level, there are waves and swells.
Yep, water is pulled towards wherever down is - and in the case of a round Earth, down is towards the collective center of gravity, which is towards the core of the Earth.
Water is not doing anything magic curving to the side of a "ball Earth", because that ball Earth is floating in space, and in space there really isn't any "up" or "down" (at least not in the sense that we imagine - though you could say that in the case Solar System,, "down" is towards the Sun, which is the center of gravity of the Solar System, and all the planets are falling "down" towards it, but we don't hit the Sun because....well...that would divert this into a discussion or orbits and orbital mechanics, and maybe someone else here can explain that part of it better than I could.)
But often I get the impression here that a lot of Flat Earthers imagine a ball Earth as like a basketball not floating in space, but suspended over a flat plane which has it's own gravity, and tha is not the case. The Earth is in space, the only "down" is towards the center of the Earth. And my "down" is different from your "down", because we are on a ball.