Can't afford a "real" co2 setup right now, and where I live I have checked
into sources and the only thing I can find is a place that charges a LOT,
and you switch tanks each time. There are no home brewer type places here.

http://www.dlink.org/aqua/CO2.html

But I'd use this needle valve as it only cost a few bucks more and is
extremely good and I'ver used dozens of them over the years.
Call and ask for the 10-32 thread with an 1/8" barb port and the 1/16"
to 1/8 brass adaptor.
They are nice folks.

If you plan on having more than one CO2 injected system, get 2-3 etc
valves as the shipping will cost the same and you can T off the main
reg and tank for independent control on as many tanks as you want to
have.

http://www.clippard.com/store/displa...sp?sku=MNV-4K2

If DIY is an issue, baker's yeast works fine. Any market sell it.

Regards,
Tom Barr