Whether you are doing salt or fresh water tank. Most tap water is fine to use, you must be de-clor which takes out the cholorine that cities use to treat the water. You also must let the water sit for 24-48 hours to get to room temp. Then when you get the fish you acclamate them to the water by keeping them in the bag they come in and attaching the bag somehow to side of tank so they dont get shocked from putting into different temp water than what is int he bag. Usually 2-4 hours is enough. Keep your receipt for the fish, most good stores will guarantee their fish up to two weeks. Petsmart does and Walmart does. Dont forget to only take out a little over half of the water when its time to change the water. You leave the rest so that you leave the good bacteria that the fish work so hard to create in the tank and once a week feeding is ample, fish only have a 3 second attention span, so they dont even know when the last time they were fed. Of course if you feed them they will eat but its not good for them....
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you need to put your fish in tap water that has been TREATED, AND NOT COLD OR HOT BUT KIND OF WARM...then let it set out over night to adjust to room temp. Treated- use declornator...its very cheap You should put your fish in spring water but make sure it's WARM .(my betta likes springwater) :P The above answers are good if you have fresh water fish, but will kill a salt water fish. Make sure you know what kind of fish you have.
Regular cold water will do just fine. They don't need aquarium heaters, but they do like it to be anywhere from 65-72 degrees. Basically, whatever temperature is comfortable for you - set the fish bowl in your environment and it will be just as comfortable.
(By the way if you buy WaterAir Conditoner, MAKE SURE YOU READ THE WHOLE LABEL ON THE BACK AND FRONT. YOU WILL NEED TO KNOW THE DIRECTIONS AND WARNINGS!!!!!!)
Bottled water works, or if you own a dehumidifier you can use the water in there for your tank. If you use tap water i suggest you get droplets to put in it that gets the chlorine out of it.