How many babies do fresh water fish have?

I really do not know how many babies and a fish have, I also would like to know

what kind of water should I use to put my betta fish in, every time I used tap water

my fish stays for at least 4 days and then it dies. Some one told me it might be the

wrong water I used.

Thanks

Sonia

Fish vary in the number of young they produce and the way in which they produce them. For example, Guppies and platies are live-bearing fish, which means that they give birth to live, free swimming young, usually around 50-100 young per birthing, whereas betta's create bubble nests and eggs are placed into this by the father who then guards the nest and the young until they are able to fend for themselves.

As far as the water goes, you should not use straight tap water...ever! The chlorine and other chemicals contained within tap water to make it suitable for human consumption are often lethal to fish. You should remove these chemicals and heavy metals by either filtering the water using a reverse osmosis unit, or you should by a water treatment designed for use in aquaria (you can readily buy these at your local pet or fish store).