If by "untapped" you mean water that has not come through the reticulation system and has been obtained from other sources, the answer would depend upon what the source was and the parameters and constituents of the water. Goldfish need good clean unadulterated water as do most other living things but I would guess that if you can confidently drink the water then the goldfish may be OK living in it.
Water.
In waterin the water
no
I wouldn't think so as goldfish can't live in salt water.
The fresh water part .... Goldfish apparently come from Asia, however they don't live in the ocean because goldfish are fresh water fish.
Yes
A goldfish.
water
yes
No unless you want a cooked Goldfish!
Goldfish are meant to live in cold water, not the warm water in a tropical aquarium. This is a huge reason why goldfish and tropicals shouldn't be in the same tank.
They can but they shouldn't. Gold fish like colder water and guppies like warmer water. They can live when the water temperature is in that in between range when they are both not comfortable.