tap water is actually a lot more rigorously regulated and 'checked up' than bottled watter n stuff. the federal government does not require bottled water to be safer than tap. ironically, just the opposite is true in many cases. tap water in most big cities must be disinfected, filtered to remove pathogens, AND tested for cryptosporidium and giardia viruses. bottled water manufacturers are still subject to health regulations, but not as stringently as tap water
shit happens though so change out the water filter every now n then mate