I know dialysis patients have a list of crap to eat in case of emergency, but I'm going to go with the Nepro Cans. Complete nutrition for people on dialysis.
They do have a website:
http://www.ross.com/ then click on Product Handbook at the top and then type in Nepro in the search and it should come up and you can read about it.
You can order as little as 1 six-pack for $13 and that includes shipping. The number in the United States is 1-800-986-8502.