Newbie question about yeast starter. Ive got a good starter going right now and want to ramp it up by decanting and adding new wort to the yeast cake when the time comes. But i won't have time to do the boil-icebath-cool when it comes time to step things up. Can I just boil up a batch of wort and store it in a sanitized sealed growler until the starter is ready for stepping up? Or am I playing with fire and just asking for an infection?