Hep C alone would usually not cause ascites unless there is also cirrhosis present. As Bill said, salt restriction is important -- sodium content is usually highest in packaged and processed foods, so in addition to not using salt, it's important to read labels and avoid high sodium content (<2,000 mg a day is usually recommended if there is ascites). Doctors might also limit fluid intake or prescribe diuretics. Hope that helps.
~eureka
Mikey, I am also interested in learning more about diet. I will follow your post with interest as some more knowledgeable posters answer you.
You should probably be on a sodium restricted diet already if you have developed ascites; although I believe the primary treatment consists of the drugs Lasix and Spironolactone. Have you had paracentisis performed yet? What does the doctor recommend?
Bill