Chicken Soup is a food that works well for some, but not all...I agree, it has a LOT of grains. Good brands include Nutro Natural Choice, Innova, Authority is decent as well. In general, you want a food that doesn't have by-products or by-product meal as it's protein source, or even, as some do, corn gluten meal as their main ingredient. Skip a food with whole, ground or cracked corn, and imo, soy isn't something I want to feed either. You want a simple ingredients list of meat/poultry or fish in the first ingredients, not a ton of carbs, and no use of preservatives such as BHA/BHT or ethoxyquin.
I would *not* recommend Purina as these are the ingredients in the kitten chow and they are all on my ick list: "Poultry by-product meal, brewers rice, corn gluten meal, soy flour, beef tallow preserved with mixed-tocopherols (source of Vitamin E), fish meal," <----no problem with the fish meal or use of mixed tocopherols as a preservative.
It can be confusing, but use the above as a guide for what to avoid, and see what you can find at your local store.
The discussion on dry food or wet food has been continuing across many past threads, I'll let you do a search or browse to find them, and then would be glad to try and answer any questions.