Get a disposable Freon or ecological substitute tank. Up to about 100 PSI
they are fine.
actually stronger than that but we like a safety margin ;-)
They come with a 1/4" flare fitting that can be adapted to almost anything with
off the shelf fittings. Some even have 1/4" NPT threads on the valve to tank
junction but they are rare these days.



I fully understand the significane of employing an air tank. As an
hobbist, the major difficulty in putting an air tank in the design is
it is difficult to find a cheap, commerically small air tank