Can brain eating amoeba survive in tap water?

Yes, but usually municipal water supplies are chlorinated enough to kill it. The problem is when pipes are old or water tanks are dirty. Then the amoeba can survive.

It can, if the tap water supply is not treated properly. There have been cases in Pakistan and the U.S. where people used tap water in neti pots and got infected. That’s why experts recommend boiling tap water before using it for nasal rinsing.