We were flying into Miami this past May for a week-long cruise, and the airline loaded my wife's and my luggage on the wrong plane. Even though we flew in the night before, the luggage didn't arrive back to Miami until the cruise ship was leaving the dock. Only our son's luggage was still with us.
We ended up having to do a Target run that day to buy enough clothes and toiletries to last the trip. Not fun at the time, but we made it work.
In your scenario, you can just catch a ride to a nearby Target or Walmart and stock up the missing items. It'll be fine. Have a great trip!