water quality depends on location. Use whatever works man, its not like your going to really be noticing the water when your hitting your pipe, its the weed your lighting it for. I like the idea of chilling the water, that hasn't occured to me yet, but I haven't had an opportunity to chill water when I use a bong ) [in Hawaii we often hot boxed the car with a badass triple thick bong, now that is REAL hotboxing]