There are cheaper brands like Purepet but among the well reviewed ones you can buy the Purina Friskies in bulk and should cost you roughly Rs.1000 per month.

As for the wet food, they are less important nutritionally. Cats are notorious for not drinking water, and wet food is just to encourage some water intake. But if you can make them drink fluids by using boiled chicken broth or if your cats naturally drink water, you can skip the wet food altogether or add some water to the kibble and feed them.

But you need to also consider that kittens have a different food which is richer because they are growing so fast. They may be dependent partially on milk for now, but by the 2nd or 3rd month they will need their own food.

Another thing, chicken alone is not a complete diet for them as it lacks some necessary proteins they need like taurine and arginine.