What happens if you put a betta fish in tap water?

When I first got my fish he was really jumpy. But then he started staying at the bottom of his bowl and not eating. Im starting to think it is because we put him in tap water not bottled water. So can someone please tell me what happens if you put your betta fish in tap water and if their is anything I can do to... show more When I first got my fish he was really jumpy. But then he started staying at the bottom of his bowl and not eating. Im starting to think it is because we put him in tap water not bottled water. So can someone please tell me what happens if you put your betta fish in tap water and if their is anything I can do to help???????
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