Can you get the bottling bucket someplace cold? You don't have your location in your signature, so I am not sure where you are. If you are somewhere cold (like me) cover the bucket tightly and get it as cold as possible without freezing (e.g., my garage is about 0 degrees right now). The yeast won't have much of a chance to ferment the sugar before it gets too cold, and it should be fine to store it for a few days until you get a capper.
On the other hand, if you live in Canada, have you checked a grocery store yet? Almost all of them up here sell cheap beer kits and basic equipment, like cappers.