I don't have trouble with water, it's just a thought if it acctually works.
So if you're on a long roadtrip you can have a small bottle of fueltreatment under the pillion seat next to the bottle(s) of oil and chain spray, and call yourself Justin Case
On the other end of the scale some high performance tuning does use water injection to make an engine run cleaner and cooler, it also does something with the detonation if your your running high comp, think it also helps against knock if you run high octane can't remember all the details, maybe I'll get around to searching it up again.