If you have a water filter (usually with activated carbon/charcoal), then that usually strips any chlorine or chloramine from the water. I know it does in my case as I've tested it. In fact, it's a good way to know when a water filter is too old and needs to be replaced -- you start to measure some chlorine or monochloramine if it needs replacement. Bottled water (i.e. spring water) is also likely to not have chlorine or monochloramine in it, but you can always test a suspect water source on its own to be sure. Carl is right that actual distilled water is the safest bet, but these other options have also worked for me. In particular, if you are diluting to measure TA or CH (for some reason -- usually dilution is not required for these tests), then using distilled water is really the only way to do that properly.

Richard