LOL -- been there. If there's any yeast and sugar left, and you can get fermentation. You've got to let it ferment all the way out and clear, (or use heat, chemicals) before you bottle/seal it or you risk that. If you added sugar to sweeten it up, you probably woke up some yeast and restarted fermentation.
Mine's going to be bottled in heavy wire-bale bottles, like below, but also pasteurized when it's at the right carbonation level to shut things down permanently.