> Now what would be a good gas to pressurise the bottle with?

Must not be active / compustible.
CO2 or air work fine.

Energy in a 1.5l bottle is about half that of a 38 Magnum load. It 
lets you know exceedingly well audibly when it escapes. Using 
aforesaid garden fork (and a full face helmet on one's head) has one's 
ears ring for many minutes afterwards. AMHIK :-)


        Russell 

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