In recent years, a number of commercially-prepared frozen raw diets have come on the market. Local stores may still only carry these products. Luke's all natural carry these products, but they don't ship them. They can be purchased in-store only.
Cats' digestive systems are finely tuned to handle things humans can't. Their stomachs have a highly acidic environment, which is an excellent deterrent to ingested bacteria. In the wild, cats sometimes eat some pretty putrid stuff with no ill effects. Wild cats die more often from infection due to injuries than from food poisoning. However, there are steps you can take if you have concerns about salmonella, e coli, or other bacteria.
You can put together your own recipe, using wholesome, natural ingredients. This method is a bit labor-intensive, but if you're handy with a chef's knife, or have a yen for the personal touch, you may prefer it. You are encouraged to do your own research, but here are some suggestions for the basic ingredients, in descending order, quantity-wise, with about 75% meat:
Cats are obligate carnivores and their systems have evolved from thousands of years of eating a raw food diet in the wild. A raw meat diet supplemented with grains, vegetables and fruits, taurine, certain enzymes, and essential fatty acids will closely approximate the food your cat would get in the wild. Controlled tests using two groups of cats, getting either raw or cooked food (otherwise identical) revealed: