Nothing. Hair grows approximately 1/2" per month. there is nothing you can do, eat, take to make it grow faster.
You can however keep your hair healthy by regular trimmings of split ends, avoid chemical processing, heat from straighteners, etc. Healthy hair looks longer than the same length hair that is damaged and has split ends.
calcium from things other than dairy products. try experimenting with different exposures to sunlight. DONT GET SKIN CANCER. also yes, keeping your hair clean and away from any source of modification such as crimpers and hairspray. blowdryers are also a good thing to stay away from.