In order to make the voyage from the gate to baggage claim, do you recommend any specialized hiking inserts? Can you get by with normal tennis shoes in a pinch?

Also, about how much fluid should I plan to consume during the walk. Will a 36 oz. water bottle be enough?

Finally, should I let anyone know my walking route ahead of time just in case I don't show up at baggage claim? Should I pack an emergency signal flair or two just in case?