thats interesting about the guy. sounds like something he is doing is working for him.
the unit may be very good. i just got frustrated with the vague explanations about how exactly the unit works and what type of filter it is. i couldn't find anywhere where it mentions it is ceramic based. did i just overlook something?
anyway, if its just the reservoir the ACV should work to cut that plastic taste out.
another idea is to leave the drain open so the filtered water immediately drains out and into a glass receptacle. not sure if thats possible but it might work.