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Haaaaaaaaaaa I don't have anything against tap water and it think the tap water is nearly as sterile as the sterile saline and i very much support using tap water.
It depends on how much reliable is the tap water source and think sterile liquid applies to the tap water as well but depends on the water supply and most of the water treatment plants do use chemical sterilization which is as good as ionisation technique used to sterilise the so called sterile saline/water used in hospitals.