Thank you for your comment. Actually regarding tap water I have a colleague that studied it as his PhD thesis and he found that the concentrations of some pharmaceuticals in tap water were high enough to cross the placental barriers and affect the babies in pregnant women: https://www.sciencedirect.com/science/article/pii/S0006291X16305940 so I would avoid drinking tap water if you are pregnant
RE: The science of scamming people