02-23-2012, 12:05 PM
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You may have a misconception about water.
First, "pure" water cannot support life, so you do not want to have just pure water in a tank. Such water does not exist in natural habitats with fish.
Second, if you have municipal tap water it will likely be safe for humans, though this might vary depending where you live in the world. Normal tap water in North America or Europe is fine, with a good conditioner. It may need adjusting with respect to GH and pH in some cases for certain fish, but generally speaking it is the best water source for an aquarium.
Third, some bottled water is not good for fish, or may be worse than tap water.
Knowing exactly what you think is wrong with your tap water, and knowing what fish you intend and what the GH and pH are, would help us provide more advice.