My flight is 00:30 on Sept.29 at HKIA and I would like to check in my luggage at 10:00 on sept.28.

My friend will give me a drive to Kowloon Station in the morning. I understand that I need ticket to go in the check in counter.
However, I need to go out from station after checking in the luggage.
Can I use the ticket AGAIN in the same evening to go to the airport? Should I use Octopus card OR buy a single journey ticket?
Thanks.