I was trying not to dirty my hands with this thread, but I give in.
Seriously Durbkat, ask yourself; why you aren't upgrading your betta's tank?
Is it that it's too expensive? Surely you can save up the $2-$3 a 1 gallon bowl or kritter keeper would cost. Christ, just buy a tupperware tub for $2, or buy a 1 gallon jug of water... then you could use the contents as well! I'm sure if you were to ask around at local restaurants one would even have a 1+ gallon jar they'd be willing to give you for free.
Is it that you don't have the room? If I can make room for as many tanks as I have in my two little dungeons of rooms that are already filled with an unbelieveable amount of crap, you can make room for one more half of a gallon on your desk.
So, ruling out the first two options, the only possible reason I can see for you not having upgraded your betta is that you're either just plain lazy or you don't care. That betta is a living thing, man, and what's more is it's in your care. That fish is completely at your mercy. He doesn't eat if you don't feed him and can't move to better waters if his water quality is less than optimal. I almost feel bad for my bettas that live in 1 gallons because of the lack of space, it's hard for me even to imagine what they'd look like cooped up in 1/2 a gallon. You've got to wake up and realise that your fish would probably enjoy being able to actually move, nevermind how much better water parameters would stay.