Now- I know that bettas can be addicting and let's face it, they have personalities. They're great pets.
That being said, PLEASE, I suggest you not get another betta if your first one doesn't have the proper equipment.
I've seen way to many people say they can't afford this or that, then they go out and buy another betta.
Be responsible ~ I completely understand that fish can get expensive and most of us don't realize that until after getting a fish. But when you know better and go buy another that is in my mind unacceptable. Save that $4 or $6 + and rather than buying another betta, use that towards say, a heater! Or a tank! Or whatever it is that your betta is lacking.