Honestly I don't think it would be very suitable. As I said, to have the water at a safe level to prevent jumping he just wouldn't have enough room. You could try to make a cover for it, but in my opinion the lid, heater, and filter would ruin the look of the bowl anyway. Plus, the less water in the container, the more often you have to change it. The smallest tank I ever use to house a betta is a 1.5 gallon kit, and that's more of a temporary home / backup tank in case one doesn't agree with a community. Water changes every other day just suck, even of it is a small tank. A 5 gallon tank is just about perfect for a betta. It is easier to cycle because a larger filter can be used, and the extra water volume really helps with water quality. I would suggest nothing smaller than 2-5 gallons, and no matter what the size, get something designed to house a fish.