This condition in sometimes called edema. You should be sure your doctor knows about it. And you would be someone who should definitely be careful with salt. However, remember if you are dehydrated or low on glucose, you'll get dizzy and feel nausea if you exercise. So be sure to drink fluids and eat a little something before you exert yourself.
Protein is a good topic, thanks nicfamhcv.
How much you need can really depend on what's happening with your liver and your disease. For people with cirrhosis and encephalopathy 20 - 60 grams per day is recommended. Yet, if you have muscle wasting, an increase in protein may be recommended. Also important to remember about protein is its connection to fat, which is hard on the liver. So fish is a better source than heavy red meat.