Items you need:
2 ft. common electric wire (any laying around in the house)
4 small alligator clamps ( $6 for 4 at the hardware store)
A bit of electric tape.
3 9V batteries ( about $ 10)
Distilled water $0.99
Saline (eyewash drops) $2-3.00
1 ft silver wire, 999.99 pure . $10-25.00, depending on gauge, a thin one will do fine.
A glass (for the electrolysis) no plastic or metal containers
Instructions in the video.
You don't need a box for the apparatus or soldering anything. twist the wires and cover with electric tape. Just connect your batteries in series to get 27 Volt.
When you are done, clean the oxidized wire with a rough cloth or soda, and store all the pieces in a zip-lock bag until next time.
Store colloidal silver in glass, away from light.