the question is, how fine a spray of water? you don't want to run your garden hose into the intake manifold with that mist setting if that's what you're thinking. water injection used to be a somewhat popular "mod". i don't see the kits around anymore - must be a reason why they fell out of favor...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"