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Go to your local welding supply shop and get a tank of co2 from them. Have them make a hose for the tank and a cheap pressure regulator. Have a small plastic tub with a good closure and drill a hole in it to match your hose barb size. Make the hose barb a permenant fixture to the tub. Attatch the one end to the co2 bottle/regulator and the other to the plastic tub/hose barb. open the valve and allow a small amout of co2 into the tub.
This co2 is cheap, it is what is used by any beer drinking person that has a tap system such as they have in bars. The initial setup won't be the cheapest, but it will last you a long time as long as you only use enough co2 to do the job. How much depends on the size of the tub.
I've been using this method for a long time and don't see any need to make changes.
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