First, you need to know whether your water contains CHLORINE or CHLORAMINES. Both are commonly used to treat municipal water sources. If you have chlorine you don't really need to use a chemical to get rid of it. Chlorine tends to dissipate from water if you pour what you want to use into an open bucket and leave it out overnight. If your water is treated with chloramines, you'll need to use an aquarium or reptile water treatment chemical to get rid of it.