Muscle96ss,
I was on dialysis for a little over a year before my kidney transplant. I don't know where you live, but if Marijuana is legal in your state, it really helped me cope for a time period with the nausea. Some transplant clinics do full panel drug tests, and I had to abstain for a full year in order to get my transplant. Silly, but nonetheless.
I usually did not work out at first on my dialysis days. Most of the time, I would go home and sleep for 2-3 hours afterwards. You feel pretty beat at first. Plus, you are on blood thinners, so later on, when you have a fistula, you can bleed again when your blood pressure goes up during a workout. You will initially have a catheter in your chest, with two tubes basically sticking out. It is extremely important to keep that area clean, as the catheter is connected to your heart. Even when you shower, you have to wrap the area around the catheter with saran wrap and tape to ensure it does not get wet. An infection in the area could be fatal. Once your fistula matures, life is a little easier. Mine was/is on my arm. As you workout, and use the fistula more often during dialysis, it will actually grow. Some people would freak because of the size of the fistula. But, it was a trade off. I truly feel like working out and keeping muscle mass on helped my survival.
You must be extremely cognizant of potassium. Too much potassium, and your heart can stop when they take blood during dialysis. The concentration of potassium can rise to dangerous levels. I literally saw them wheel out a women across from me who made this mistake. Watch all minerals in general. Calcium can get dangerously high too, causing some muscle shutdown. At one point, I had hypercalcemia, and literally almost lost all muscle in my legs and calves at one point. I was able to fight back, and went from not being able to do a bodyweight squat, to squatting 400 and deadlifting 500 two weeks out from my transplant. But, I didnt get out unscathed. I suffered nerve damage during this time in my toes. I had to almost learn to walk again over the last 4 years. No one has been able to tell for the last 2-3 years, but I had a noticeable limp before that. Moral of the story, watch eating too much of anything that has potassium or calcium. Never take a multi vitamin.
I would try easing into a 3-4 day a week routine. I would stay away from failure, as excessive muscle breakdown could accelerate problems with your kidneys. Cardio should be done every single day that you can do it. Keeping blood flow, especially to you lower extremities is vital during this time.
As far as supplements...I would caution you against using most. Coffee at best if you need energy. The only thing I found very helpful was using BCAAs on top of meals. Especially with the lowered protein intake, adding 5g 2-3x a day with meals can help prevent muscle loss. I read into some alternative therapies, and there is interesting reading on MK-677 and cialis/viagra during dialysis. I am not recommending these, as taking in anything could have possible negative consequences on your health. But. the theories are interesting nonetheless.
I am just sort of rambling here, but if you have any other questions, shoot.