Impossible to answer this worth a cr_p. It's like asking the question "I'm going on vacation. What do I pack."
Weddings can be quite different, presenting different challenges and therefore requiring different equipment strategies.
Advice, make sure expectations and limitations are clearly explained, and understood, and accepted by all involved. Have back ups for everything, camera body, lenses, lights, cards, etc.
Or this advice ..... If wedding photography is somthing you wish to pursue professionally, find a qualified pro to hire (maybe with some assistance from the client) that would agree to let you second shoot with them and learn. Think of the cost as part wedding gift from you, and part investment in your professional development. Kind of a hands on learning experience. Surely the client can pony up some money for their special day.