Blast your fizzy drinks bottles into the air with a few simple items.
Cycle inner tube, two wire coat hangers, gaffa tape, bottle, string, cycle-pump.
EDIT: Our Beaver section did these to great effect by drilling a hole through a wine bottle cork and pushing a needle valve (as you'd use for inflating a football) up through. As long as you've got 3 or 4 different pop bottles and 3 or 4 different corks you'll find a couple that fit nice and tight, might be easier than wrapping an inner tube up, especially for Beavers.
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