Please be aware that there may be significant risks associated with using colloidal silver, and the end user must make his own choice with regard to its use. Assuming some skill with a soldering iron, you should spend about thirty minutes constructing the generator. Connect a 24V incandescent lamp in series with either positive or negative output lead. Insulation is shrunk over soldered connections using a heat gun or hair dryer.
Pure silver is sometimes available at electroplating supply companies.
Or, inquire at a jewelry store specializing in silver about who their wholesale supplier is. If the Silver Colloid is to be ingested or injected, be sure to use distilled water. Tap water is fine for other uses, such as for a topical spray or for plants. Also, before beginning to make your Colloidal Silver you will need to make a saline solution for enhancing conductivity. If you are using filtered spring water, no saline solution will be needed as spring water already has a natural saline content.