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I have a filter before the water comes in and after it comes out of the water tank.

Heated water is kept in a different reservoir and the piping uses heat resistant PVC.

In Brazil, most times the water has a smell of chlorine so I guess the chances of it having deadly/lethal microbia there are next to null?

Drank water from the tap (where plumbing is done properly) for all my life, never had any problems so far.

You don't have daughters.

You don't let the water run for a bit before drinking it?

If you have a water dispenser (through a refrigerator), do you fill and dump two glasses before getting yourself a glass of water to consume?

I guess I would. It seems dangerous not to for the reasons mentioned here.

I hadn't got a water dispenser like that but I'd be really surprised to find that the internal reservoir and piping was made of anything except for plastic.

Some actually have coiled copper (it transmits "cold" better) - but almost all of them have a filter.

I think it's safe to say many, many people don't do this.

I don’t, why should I?