Looking to build a simple solar powered hi voltage low current power supply

I need to build a solar powered colloidal silver generator. To treat my water on camping trips. As both a practical way to treat water for drinking and for the coolness factor of having built something practical that does not need batteries.

I've built DC voltage multipliers before with the diodes and caps in a lader fashon. They are not very efficient. So I know I need to build an RL circuit. then I guess I need a transformer to step up the voltage. I would like to step the voltage up to at least 600 volts or as high as 2k volts I don't need much current. The device I use now is a simple three 9 volt batteries in series with .999 fine silver for the cathode and for the anode.

I treat a solution of distilled water which I then pour into the water I'm treating. From what I understand the higher the voltage the more stable the silver ions in sollution, and the greater the percentage of nano-meter sized silver particles which are the most effective at killing bacteria, fungi, and virus's.

At just 5 parts per million this sollution is said to kill bacteria in 4 to

This sollution will even kill pathogens like Anthrax, Small Pox, and Malaria.

Thanks in advance for any ideas or input! Robert Miller