This is interesting, there doesn't appear to be a consensus on when and how bathing after a c-section should happen. From what I understand, it depends on how the wound is doing.
If the wound is closed and is not infected, I think it's okay to close it up with plastic wrap and take a bath. They say that adding epsom salt in the bath is also a good idea because it prevents infections if the water does get in the wrap.
If there is an infection or if the wound is oozing out blood or fluid, then it's not okay to bathe at all until the leaking stops and the wound heals.