I reckon the easiest (!) way would be in a darkened room with two synchronised flashguns set to lowest power for short duration of flash so would not have to have long exposure and noise worries. Without specialised equipment there will be a limit as to how fast an object could be 'frozen'. How about a dart? You would need just a little ambient light to see the target water filled balloon but with a fast shutter speed that would be irrelevant exposure wise.
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