My past experience with alcohol/water injection was with a 1966 Hemi Charger, and I will say that it really improved not only performance, but the general tune and reliability of the motor. The method I utilized was a simple vacuum hose draw from a 2 gallon plastic canister. The vacuum tube would draw about 2 gals per tank and that amount seemed to really "clean out" the insides of the hemi. The wator vapor (not sure if teh alcohol helps) added hp by lowering the temperature of the air prior to combustion and by adding a few extra oxygen molecules to the bang. It worked well for me.
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