What is the very best food to feed my cat?



My little Queen has had a litter of kittens, all born healthy as can be. Im now very concerned with her and my kittens health when it regards their food. I looked at the ingredients list of their dry food, and Im shocked. Corn meal being number one, an poultry by-product meal being second. What is the best, and most affordable, cat food I can give them, and how may I supplement their diet?