There are a number of highly regarded Akita owners/breeders who feed the BARF (bones and raw foods) diet. Probably chief among them is Barbra Bouyet. Key BARF and Akitas into a good search engine and you'd be amazed at the resources you find! BARF can either be "homemade" or purchased thro specialty distributors over the Net.
I do my own cooking and have a strapping 130lb male in excellent condition to show for it. Good luck!