I have a water injection kit but I use a 50/50 water+methanol mix. Not sure how far I would get on 10L as it depends how you drive it as it only injects at high boost.
I ran 50/50 water methanol on my 924 Turbo Carrera GT spec. Ran much higher boost. I ran it off the washer bottle which was about 7.5l but was not enough for a long run using the washers/wipers.
so you can use it for induction cooling AND washing the buggs off the screen.
awesome!!!
TBH water/methanol injection is often substituted for when an engine isn't properly mapp'd, or your trying to get more out of it than what is really safe.