I have a bad alternator but I can't buy one. Will unplugging my battery while not in use be help full if you need the cargos things

NO! Your alternator is bad and the battery will be drained every time you drive it. Disconnecting the battery while not in use won't help because the vehicle is not running,so there will be no drain on the battery,only when you drive it and it will stall on you at some point,then you will have a tow bill. don't drive it until you buy an alternator!