Just the tiniest thread of comfort slanec, hopefully your friend has left a full water bottle and full bowl of food in the hutch. Desperately trying to remember our bun's eating habits it should be ok, as being enclosed in a hutch they tend to me more or less immobile and just nibble bits and pieces rather than cleaning the plate all at once. They also eat their bedding straw/hay - so don't panic too much....but the only thing I would be concerned about is water. Like most creatures water is a necessity, especially if the cage attracts the sun.