It may be my hair - I never used any kind of filtered water on my hair. I do use an oil hair pack at least once a week. and never used any other shampoo than Johnson and Johnson or paraben free (right now I am using 'not your mothers' charcoal shampoo, it is from ulta. I do not use any conditioners. Before I Flat iron my hair, I use a heat protectant - I use its a miracle 10, available in most of the stores. I eat multi vitamins everyday, after the first child I switched to prenatal vitamins, and added omega 3, and biotin, and still doing that. Hair fall is very depressing. I use an avocado-coconut oil-olive oil-egg mask and sit for an hour and wash with shampoo. This is once a month or so. I use moderate hot water to clean my hair because I use a lot of oil. I am not sure how often you wash your hair. I do it twice a week only. Also, I brush my hair morning and evening. And I go for haircuts twice a year or if I am growing long, just once a year - I pick a package of wash,cut and style and ask my stylist what products are best or best practices to keep hair healthy. They can recommend depending on your hair type. Mine is fine hair and brown. If you use public water system, the tap water is good for drinking, that case IMO it should be good for hair too. Again, it is just my personal opinion. Try the same routine you had in india. If you use to have oil on hair, use the same oils before you change to anything else. One other thing is check with a doctor if you have any hormonal imbalances or any change in the body - weight again, weight loss or allergies, or even stress and such. Usually hair fall is just a symptom of other underlying issues.