Actually the person is slipping drops of sodium chlorite into their water. I'm not convinced of the chances that it will contact a "weak" acid to be able to convert to chlorine dioxide. The stomach acid is not weak. I've never gotten onto the boat when it comes to Stabilized Oxygen. That is how that product was supposed to work. I know there are hundreds of testimonials regarding SO; so there must have been some interaction with weak acid somehow. By chance? Well, I consider this physically harmless; however, I also think it could become a betrayal. People should be careful. It is bad enough that we can't really identify what is in our food supply or even our municipal water.