I have well water so no chlorine or chloramines. The water comes out of the ground at 54 F which is too cold to use straight. I use a garden hose to spray it into a 50-gallon plastic drum and let it set for at least 24 hours so it can warm up to room temperature.
There is more than chlorine to consider in making your water suitable for fish.
You need to consider temperature, chlorine, chloramines, oxygen, dissolved gases, pH, and hardness.
Chlorine and chloramines we all know how to handle -- just add one of the commercial dechlorination liquids readily available in the hobby -- commonly referred to as water conditioners.
Temperature is controlled either by mixing hot and cold water or allowing the water to set in a spare container until it comes to the desired temperature , sometimes a heater is used to get to the right temperature prior to use.
Oxygen and dissolved gases are often ignored by hobbyists.
But if you ever see lots of tiny bubbles on the glass, plants or fish after a water change you have a dissolved gas problem which can adversely affect your fish. Almost any water source which is under high pressure will have too much dissolved gas in it. This extra gas, like a soda, is released when the pressure is reduced. Under worse cases, the gas comes out inside the fish causing them internal damage. The easy way to remedy the excess gas problem in water under pressure is to spray it through the air. Even a short distance through air, like 2 inches, is sufficient to get rid of excess gases and bring the oxygen content of the water up to the maximum. And by the way, oxygen levels in water from the tap can be much less than the maximum. Oxygen may have been consumed by a variety of processes on its way to you, including consumption by bacteria (anaerobic or aerobic) or corrosion.
Hardness and pH are normally constant in any particular source and since fish can adapt to most any hardness or pH given time, most hobbyists tend to ignore these factors unless their water source has them at some extreme. But that is why RO units and ion exchange units and rain water are used. I did write an article published recently by CCA on this.