Hello Mimo, I live in India as well. I am touched by your efforts to help your little kitty. Also, I feel for your little kitty. How is he now? I can relate to you as I live in an area where there is no good vet. Which city do you live in?
It looks like your kitten was unwell even before you found him. Sadly this is the condition of many abandoned kittens in India. Or maybe, the food you are giving your cat is not agreeing with his system. That’s why he is not retaining it. Do not give him cow’s milk at the moment. Also, please check his stools for signs of diarrhea or any blood. If so, he needs a vet.
I have 3 cats (Pepper, Mint and Ginger) and I feed them on Whiskas, which they love. I live on the outskirts of Mumbai and Whiskas is available in a pet store(just one store) and in a single pharmacy store nearby. However, when I found them, they I had the same dilemma and anxiety as you. I started them on newborn human baby formula (Cerelax, Farex). I knew that these products weren’t formulated for cats, but I had no option. Fortunately, my cats survived. They do not drink cow’s milk even when offered, and I’ve never seen what KMR looks like.
My 7 month old kitten, Ginger, loves boiled fish and rice. She also loves skimmed cow’s milk (Amul or Nestle Tetrapack), which I give her only occasionally. However, avoid it if your cat has diarrhea.
I have a vet nearby, but he is not a professional. Whenever my cat’s had problems he prescribed human medicine in small doses, since cat medicine is not available. When my cat had a urinary tract infection he prescribed amoxicillin syrup (known as Mox pediatric suspension.
Also, please keep your older cat away till this poor little kitten get’s well. Keep them in separate rooms if possible. When I introduced Ginger in the family, my older cats, Pepper and Mint would hiss and growl at her all day. After a couple of weeks they have accepted her, but Pepper still growls at her.
So try various food combination: Farex, milk+raw egg yolk, boiled egg-yolk, boiled chicken, a little boiled fish,..whatever he can retain. Also, try giving him a few drops of Mox with a dropper only as a last resort if you suspect some infection, although I’m not sure this will work. All the best!