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It was just a thought coz my tap water is quite hard and has a bit or chlorine in it. Just wondered it bottled water was safe to put in without having to use a dechlorinator?
Some LFS sell water that you can fill your tank with. I have no clue about mineral water, but spring water should be fine-spring water eventually come from a tap just make sure to cycle the water before looting fish in
If you're concerned about your tap water, and you want the best, get an RO/DI unit on Ebay for ~$100. That'll give you the most pure water, yet it's not necessary for FW... tap + dechlorinator is fine.
Some LFS sell RO water over here in Scotland. But I dunno about the states. But as uscamaro said best by a RO unit it will work out cheaper in the long run.