Note Uber/Lyft don’t do grocery stops like many private car services do. To do a grocery stop you should plan on a trip from MCO to Wal-Mart then when done shopping ordering a second trip from Wal-Mart to your resort (and be prepared for whatever availability may be near the Wal-Mart).
Alternatively you could try to talk with your driver and see if they’ll do a stop, but that’s up to the driver and not really how Uber/Lyft work (I would not count on it). If you do get a driver that goes off script like that I’d tip generously in cash, personally.