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That's the good idea.  I was thinking in a same directiont, but not in the way to put somethung inside the nozzle.   

Also, I need to experiment with thermal insulation for a water bag.

Thank you.

I once used some forced scat with my release method: key to my handcuffs went up my butt alongside a bar of chocolate, but I only had my mouth available to fetch my key from beneath me. It was interesting poking about with my tongue and teeth in the brown stuff that emerged!