Questions about Betta's?

I was thinking of getting bettas after hearing so much about them. They really sound like loads of fun. I just want to know what supplies I should get (food, conditioner, special ornaments etc.) Please give me a list with exact brands (only if it matters, if all brands are equal then don't bother.) Another question. Do bettas fare better with or without filtration because I have a hydro sponge filter thats without use. Should I use this filter? That's all for now. Thanks in advance.