What is the prescription for Mizzkitt? I know that the Hills Science Diet that vets often push is not quality food at all.
When I was young I fed my dogs and cats cheap pet food until I found out the junk they put in them, looking back I should have been able to tell that just by reading the label and smelling the stuff. I won't feed my pets garbage anymore, and will pay extra for the better products. My husband and I often joke that when we're old and run out of money, we won't be able to afford to eat cat food.

layful:
I free feed my cat dry food, Blue Buffalo brand, but I might make a change since I heard that General Mills just bought that company out, I imagine the quality will go down. Along with the dry, I feed 1/3 of a can of wet food daily, so a can lasts 3 days. I pay anywhere from $1.75 to $2.75 for a 5.5 ounce can.
The Wellness Chicken flavor is grain free, chicken, chicken liver, turkey, chicken broth, etc. The Natural Balance Turkey and Giblet flavor is turkey, chicken broth, chicken liver, poultry giblets, etc. I don't think you can just give them a can of tuna as cat food, because the mercury would be too high and it wouldn't have any of the other vitamins and nutrients that they need to stay healthy. My cat is 6 yrs. old and doing fine as far as health.