That emergency chlorine treatment would be like "shocking" a pool, I would think. You're not supposed to swim for a period of time while the chemicals dissipate!
I use chlorinated city water with no problems. Chlorine will dissipate even if not in sunlight. You can pour the water in pots and just let it sit a few hours.
You can also heat the water to drive off the chlorine faster.
The rule is:
If the water TASTES good... so will the wine. No special filters or purchased water needed if it doesn't have an OFF flavor!
Cheers!
Debbie