I am considering ordering a generator (isn't that what it's called?) to make my own Colloidal Silver . I am very new to the idea of making it. So which one is not much over $100, can make small amounts at a time (it would take me forever to use a gallon), and is extremely easy to use. I have to have something that I just plug in and can't mess up since I know nothing about how it's made and what to test and all that. So, which one should I buy?