I'm keeping my betta in a TINY tank?

I don't know much about keeping bettas, but I OFTEN see them in tiny, tiny little tanks - even water glasses!! While that seems cruel to me, it is so common that it seems to me bettas must not NEED a great deal of room. Sicn this is only temporary and you'll have your tank back in a week, I think she should be fine. I would not go with moving her to a plastic or tupperware bin - many plastics can leak harmful chemicals into the water.