Just use a drill bit, while drilling the cap holes, that is smaller than the air hose, which is normally 1/4" hose. Use one a couple sizes smaller than that. Cut the hose tips at a diagonal, put the pointed tip through, grab it with tweezers, and pull the hose through the cap hole.
Also, I know alot of people say it doesn't matter... which I can't say if it does or not... but I only use bottles that are meant to contain CO2, such as soda bottles. It just makes sense to me.
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