My son is dying he has only 2and 4 percent kidney funcion how long has he got and what should I expect

These are truly questions you should be asking his doctor. Without knowing why the renal failure occurred, as well as a hundred other questions, I cannot answer this question without any accuracy.

Much more info is needed.

He has 2 stommas which is the only amount of his intestine he has left because of a operation that went totally wrong.. the left stomma is the part which gives you all the fluids the body needs to stop you from dehydration and kidneys to work properly which his body can't do anymore so he is now in renal failure

Again, without knowing his exact medical history, and without being able to review his medical records, these are not questions that we here can answer. You will need to take your concerns to his doctor.

I am so sorry you are having to go through this. And I sincerely wish I could help you, unfortunately all I can do is keep you in my prayers.