The poult's three needs right now are high protien feed, water and warmth..
Go to the feed store and get some game starter mash... Place a shallow water dish and he'll learn how to drink..Nothing too deep or he may drown in it.. Keep him in a box with a light bulb for warmth...His natural "thermostat will tell him how close to the light bulb to sleep.. Be careful that the bulb does not rest against anything, or you may start a fire.. Good luck..