Actually, I stated that the chlorine dioxide in the Miracle-Mineral-Supplement dose doesn't make it past the throat. The remaining chlorous acid does. It is possible that the chlorous acid is reduced to chlorite and that the chlorite is what is responsible for any work inside the body. This has not been studied, so it is only a guess.
It is easier to get chlorite into the body by simply adding sodium chlorite to water and by letting any activation take place inside the body. You still get chlorite inside the body, and chlorite, being a free radical, can oxidize things it comes into contact with. This has been used as "stabilized oxygen" and seems to give people some success. This has been informally studied somewhat, and the results are worth exploring.
I agree, a bath with a proper concentration of free chlorine dioxide may be the best way to go for a UTI.