Directly from the urn to the pot. Either of these methods is preferred. Water from a Shabbos urn often does not reach the boiling point. When pouring directly from an urn into the pot, one must be extremely careful not to make the kettle or urn fleishig from the steam which rises from the cholent. L'chatchilah, water should be added to the cholent before it has completely dried out, since some poskim maintain that a dried out cholent is considered to be roasted, tzli.
Most refrigerators have a light bulb that goes on when the door is opened.
The bulb must be loosened or removed before Shabbos. Alternatively, one could stick a piece of strong adhesive tape over the controlling knob, which will prevent the light from being switched on when the door is opened. If the switch or bulb was not disconnected before Shabbos, one may not open the refrigerator on Shabbos even if all of his Shabbos food is stored inside. Similarly, if the refrigerator was opened and it was discovered that he had inadvertently turned the light on or the fan off, the refrigerator door may not be closed, since closing the door will shut the light or activate the fan. The non-Jew may not be instructed to remove the bulb from the refrigerator or to shut off the switch which regulates the fan.