A good kitty food is one that doesn't have many or any carbs, such as plant and grain matter. Iams indoor can be a good food if you're on a budget. Do not get Royal Canin, full of crapola and has been making cats vomit/diarrhea/close to death in some cases.

Blue Buffalo Wilderness is a decent food too. Petsmart has it.

I know the foods may seem more expensive, but comparing the cost to how little they have to eat, it's actually cheaper than the less expensive brands. Higher quality equals less fecal matter, less health problems, more lean muscle mass and happy kittehs