What is the ideal Diet food meal for end stage renal disease patient?

It really depends on a lot of things, such as whether the kidney failure was caused by Diabetes and high blood pressure, which in the US, at least, are the major causes of end-stage renal disease, and whether your wife is on dialysis yet or not.

In general, you will want to limit consumption of foods that are high in sodium (because they increase blood pressure and tend to make you retain fluid), phosphorus, potassium, and if she isn't yet on dialysis, protein. Working kidneys can regulate the levels of these minerals, but if they fail, they will build up quickly to toxic, even fatal, levels. Even dialysis doesn't filter these out all the way, which is why you have to limit intake. In addition to limiting intake of high phosphorus/high potassium foods, she may be given a prescription for binders. These are medications she will have to take with every meal to make sure her body doesn't absorb most of the phosphorus in the food she eats; there are also potassium binders, but generally you would only use those if for some reason there was an emergency and it would be a few days before you could get another treatment in. If your wife has stopped producing urine, her fluid intake will be restricted as well - and by fluids, I don't just mean things like water, coffee, etc. I also mean soups, ice, ice cream, pudding, even watermelon will be severely cut back.

If she is on dialysis (or will be very soon), one of the first people she will meet at the dialysis center is the nutritionist. They are specifically trained to deal with the limitations of the renal diet, more so than the nutritionist you may find at your local hospital. When my husband's dialysis center sends his monthly bloodwork results in the mail, the nutritionist often will send out recipes or reminders to avoid high amounts of certain foods.

One VERY important thing that this list omits...never, ever, ever, under any circumstances, allow your wife to eat starfruit (also known as carambola), or drink starfruit juice, especially if she is on dialysis. Starfruit, for some reason that is currently unknown, is fatally toxic to people with kidney disease.