Friend with Renal failure - not urinating

Hello everyone. We have a friend who has severe renal failure and does dialysis 3 days a week. His doctors want him to do 4 days a week, but his heart is under alot of strain. Also, we just recently learned that he has not been urinating for a few days. If you go to
http://www.fixmyparts.org/
you can see his full bio, which will give alot more insight into his condition. We are desperately trying to find a cure for him. He was using Alkaline Water for a little while and apparently it helped him a little bit. Also, he can only drink around 16 oz's of fluid a day. What can he do???

he's a short snippet from the bio

"He was diagnosed with renal kidney failure in 2000 and since then he has had undergone dialysis which is a painful procedure, and was given a transplanted kidney by his father in 2002. His body had taken well to that for quite some time however, about a year after surgery, his little brother Jakob caught a cold and passed it on to Colas. At that point in time, his kidney transplant started to reject and instead of his white blood cells fighting the cold, they started to attack his kidney. His kidney function was only 40% and finally after taking several different medications daily, it stabilized." Tweet