Tap water

I know that alot of growers here use tap water to water there plants, but they leave it out for some time to let the clorine evaporate.

How long should i leave it out? Im thinking 24 or 48 hours ii forgot which.

And i dont really wanna feed my plant poland spring. Its a plant it can drink plant water not people water

24 hours is enough for the clorine to evaporate but it doesb't hurt to leave it longer. Peace