Any home made "colloidal" silver will be a combination of ionic and Colloidal Silver . The monoatomic ions are the most effect at neutralizing pathogenic microbes, followed by the smaller colloids.
If you want smaller colloids, simply pass the water through filter paper.
Copper has all the same antiviral / antimicrobial benefits like silver but is much cheaper and easier to find, which allows you to take much more if needed. Take some vitamin C to balance metabolic copper levels afterward.