Not sure on the bottle thread.all the rest can be had from screw fix! Maybe add an in line ball valve to make replacing the bottle easier.
ON CANVAS! 32 Of The Best DIY Backyard Games You Will Ever Play -- Balloon darts! Fill each balloon with a number or prize on a piece of paper.
Salzteig Ideen - Mobile selber basteln - Basteln mit Kindern (How To Make Dough For Kids)