I am from India.Here most of the domestic users are consuming drinking water from outside source like bottled water.After the bottle is consumed it goes back for refilling.On the process of cleaning the water can (Ap Capacity 30 Lit) they must add some chemicals to clean the can.Whenever i take that type of water i get severe allergy like breathing problems rashes and manifestation in skin.Normally if i take plain spring water from our well and filter it and drink it i never get such problem. I was told most of the commercial water sellers add some chemicals like betadine few drops to keep the water from bad stinking.kindly help me by answering this question