Bunch O Balloons
Get a leg up on your opponents with Bunch O Balloons, by far the fastest way to stockpile loads of water balloons with minimal effort. While traditional methods of filling and tying balloons by hand produce at a rate of about 6 per minute, Bunch O Balloons uses a custom attachment and individual stems rigged to pre-tied balloons. Screw it on then turn on the hose to fill 37 balloons at a time – or roughly 100 per minute – before gently shaking to release.
Find them at Amazon – $10+