Not in the way that most other creatures drink. They, and all Freshwater Fish, absorb water through their skin in a process called "osmotic action".
No, they are fresh water fish, therefore they simply absorb water through their permeable skin.
Lethargy in fish is usually caused by bad water. Is your water quality up to standard? Check the rules that follow and see what you are not doing correctly. All species of fish must have their water looked after properly if they are to survive. The basic rules of successfull fishkeeping are. :- 1 inch of fish needs at least 1 gallon of water.(a goldfish is a 10 inch fish) :- Every tank must have a permanently running filter. :- Every tank must have at least 50% of its water replaced every week.
No they do not. The water lice are parasites and will drink the blood of the goldfish.
Absolutely they do. Your goldfish does not want to drink or swim in your energy drink. they are for humans.
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.
Yes. goldfish breathe water so if a goldfish is out of water it cant breathe so it will suffocate
There isn't really anything that you would have in your home as standard to make the water safe for your goldfish. Provided that your water is safe to drink, it's best to purchase water conditioner from the pet store that should be used during every water change per the directions on the bottle.
You can use clean tap water for your goldfish, but not dirty or used water.
Yes, actually it must be in water. If the goldfish is not in water, it will die due to suffocation.
Even a small amount of alcohol in a fishes water will effect it badly and probably kill it. No they don't get drunk they simply die.
Don't take a goldfish out of water.
If the goldfish is swimming in water, it is alive.
What else would you expect them to swim in? Of course Goldfish swim in water.
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.