If you keep the bottles in the fridge you should be OK. You can wait until the bottles get firm to the touch. There still may be some activity in the fridge though. What kind of yeast did you use?
The point of cold crashing is to get the yeast to drop out and then rack the cider off, so there is no yeast left to cause you problems. If you dont rack the cider off the yeast, you will probably be OK as long as it stays cold.
yep, a keg bucket and some ice will work for cold crashing if you dont have room in the fridge.