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I made one for my Renault R5 in 1979. I was having problem with pinging. Water/alcohol injection has a history of cooling the engine and increasing power. I used windshield washer pump and triggered it via a latching relay and a vacuum solenoid driving a micro switch.
Once the engine was started I pushed the button to start the system. If the engine vacuum got low the pump would start. I used an Amal jet that screwed into the air box shooting a fine stream directly into the carb throat. If the engine would die I would turn the ignition off to drop off the latching relay so that the windshield washer fluid wouldn't flood the engine.
Perhaps my timing was too advanced. The car ran good for what it was.
At that time I had thought about a bubbler system but realized that it wouldn't be effective when my engine needed it, at near full throttle.
YMMV
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