Have any of you guys ever had a betta before?

Right now I have one male, but i've had others in the past. How long did yours live? Also, what did you keep them in? The pets stores here sell them in little plastic cups

and tell you they don't need much room, but I've read that they need at about 5 gallons, and AT LEAST 2 or 3 gallons. Also did you use a heater and/or a filter? How often did you change the water
Right now Flush (my fish) is in a pretty big sized bowl, and I plan to move him into a 10 or 20 gallon tank with a filter, but I was just wondering what you guys did previously or currently with yours.
Thanks
