Betta fish, need help

[Marissa]

Okay, so I was at Petco today and was browsing through their clearance items and found this neat looking Betta Home for $5 bucks and could not pass it on. To make the story short, I also had to get this crown tail betta which cost more than the house.

Here's the problem, I have no experience whatsoever on how to take care of this little guy. I bought the food and gave it 4pcs since I got home. I have not transferred it to it's new home. Can I use tap water, rain water or bottled water? How often should I feed it and how much? The directions on the food says 2-3/day but it does not say how much.

Any help will be greatly appreciated.