You can easily make ionic silver at home. Once you have a machine all you need is distilled water. You can take as much as you like. I don't no if it will work as well or better than what you are now using.
This is one of the most convenient types of silver makers.
You could use the one on the Sota Silver Pulser (blood cleanser device). The difference is the Sota doesn't have a stirring device or an automatic shut off.