Well, that handles half the problem- the extra heat doesn't really dry it out (as anyone that has ever lived on a tropical island knows
) but it does really raise its dew point so that condensing the moisture out of the gas can be accomplished at a much higher temperature, maybe even without the aid of supplemental (refrigerant) cooling. Perhaps something like the HHO output to a copper coil wrapped around an exhaust manifold (loosely) then routed forward to another coil in front of the radiator. The radiator coil could have a "T" at the low point of the last coil with an airtight removable condensate catch bottle..