I just PMed you as well, here is some quick options
Are you still in Oyster Bay?
Is it a 20 pound tank ?
Is it legal
Anjon Auto repair
(31) · Gas station
240 South St · (516) 922-7479
Closed ⋅ Opens 6 AM Fri
This station is about a 1/4er mile up the road from the shore side tanks by the train station.
Or, Try calling OBMC Chanel 71, they run launch service
and there’s a good chance the launch drivers could set you up with directions maybe a bike or a yachtie who can give you a ride.
Or, Seawanhaka Corinthian YC on center island may be able to accommodate