Quote:
Originally Posted by Sparkle
Or, capsicum oleoresin (cheaper) or capsaicin - essence of red peppers.
Entirely non-lethal, and the main ingredient in pepper spray.
I have a bottle of capsicum oleoresin in my cupboard (circa 5 million scoville heat units). Its the essential oil of peppers (steam distilled oil from dried chillis). A few spoonfulls of that in a spray bottle = instant pepper spray.
A litre bottle per water cannon tank ought to do the trick. 
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A good idea, but I think that the ice-cubes would hurt and do more damage?