Is it possible 'The Source' water has a good trace mineral content with boron and a few sulfurs in it?
There's many trace minerals that act as antifungals, and several elements used as preservatives , fire retardants and insecticides (Which the body likes to absorb because it's kinda a mineral-sponge) like bromide and chloride tend to stay in the body and wreak havoc with the normal fungal-killing activities.
I've had it real good with fulvic acid in low doses daily myself, it is also a way of getting those trace minerals in.