Water is not the same everywhere~

Tap water is seemingly better, I just realized, despite my father preaching about this for as long as I can remember. I had an ulcer in my mouth last week, so I assumed that I was 'heaty' and drank cup after cup of boiled water for 3 days, but it only led to my bladder working double-overtime... Desperate I resorted to trying tap water. Despite drinking lesser water, my ulcer healed within 3 days. I thought this was amazing, because I have no logical explanation for it... Now I drink tap water most of the time, like my father~