I started off with a fire extinguisher that somebody gave me. Don't do that though, it was a mistake on my part - there's all sorts of other rubbish in fire extinguisher gas, so it doesn't completely stop oxides from forming when you braze. Get a CO2 or a N2 bottle intended for brazing/welding, and a regulator for it. Annoyingly, all the bottles have different threads, so I needed another regulator for the CO2 can too.
I got a CO2 welding can and regulator from toolstation (UK).
The other bit of invaluable kit is the manifold gauge, which comes with a few HVAC pipes, which you'll likely need anyway? To braze, I went from CO2 bottle+reg-> manifold gauge -> system I was brazing. I needed a tiny amount of CO2 bled through continuously - too much and I couldn't get the piece hot enough.
Good luck, whatever you're up to!
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