Because we are not taught any of this, even in mechanical engineering...

Water injection helps an engine run cleaner and more fuel efficiently and usually better HP. There are plans in old Hot Rodder magazines.

Vaporizing gasoline helps an engine run cleaner and more fuel efficiently and usually better HP. There are several ways to achieve this including the bubbler and using exhaust to heat up fuel.

It isn't that you are "burning" water. It is not running on water.
(If you want to see that look up browns gas)

Properly designed engines can run on anything combustible. And a bubbler makes all hydrocarbons much more combustible. (dirty fuel oil, diesel,...)

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Please come back and tell us what fuel efficiencies you get and your experiences.