Owning a bird for a pet is having a two-year old child in your life forever. They like to chew. It is part of their natural environment. So to discourage them from chewing those things you don't want them to chew, give them objects that they can chew. The purpose of a toy is not to last a long time, it is to entertain your pet.
Most birds eat a variety of things including fruits, vegetables, pasta, breads.
Don't let you bird become a junk food junkie. Your bird will be healthier and happier if his diet is healthy. Birds can eat almost anything that you eat with a few exceptions. A bird should have enough room to flap his wings for exercise without hitting them on the bars or toys. But be sure the bar spacing is correct.