I already have a 12v battery charger for my vehicle...would that work? Also, would using some small stainless steel plates from the local metal recycling yard work and be safe to use? I have not been able to find the battery companion mentioned on indianinthe machine's website. Also, I have a new regular footbath spa. Would it be ruined if I used that (without plugging it in) when I use the plates and battery charger? I also have a coloidal silver generator....could that be used to ionise footbath water?