You need the USB Hypochlorous Generator, water, plain rock salt (no additives like iodine, etc.), power bank or USB phont charger, and distilled white vinegar. The vinegar is optional though. I just use it to balance ng pH level. Just replace the hypochlorous acid every 10-15 days. You may also need to buy chlorine test strips to. Ideally, the chlorine levels on your hypochlorous acid should be around 150-200ppm.

This is one of the generators I'm using: https://amzn.to/3qV8xux

If you need some heavy duty stuff, this one is also popular: https://amzn.to/3QVDwkJ