What kind of water disinfection is the best? Where I can buy a high quality water disinfection tools?

You need to find a water purification system, right? I know that there are a lot of different methods to purifier water, but I think that ozone disinfection of water is the best way to do it. This method is better because, for example, the use of the chemical method can have a profound effect on health, and ultraviolet rays cannot treat all surfaces.