My Dear
there is no problem if u drink tap water. i am at home cooking all types of food by tap water including making tea as well. i never feel any problem of it. To be more honest with u, install one filter unit near the tap water at ur residence will be better. this filter unit is available in all super markets. Nothing to worry at all. Govt is taking much care of supplied water. Even u must know that we are paying more water bill than Electricity and Telephone per month. Take care good luck