I'm looking for a easy to purchase chemical for the Electrolyte to make HHO for my car.

I've come across ZEP at Home Depot, but every forum seems to frown at the idea because it has multiple ingredients. The content list all seem to support using it as a Electrolyte:

-SODIUM HYDROXIDE; caustic soda; soda lye
-SODIUM NITRATE; chile saltpeter; soda niter
-SODIUM CARBONATE; soda ash; carbonic acid, disodium salt

It seems that SODIUM HYDROXIDE, SODIUM NITRATE ,SODIUM CARBONATE are all classified as good Electrolytes. Plus the Aluminum when mixed with SODIUM HYDROXIDE naturally releases Hydrogen anyways.

Does any of the Chemist out there have a opinion?