Warmth and water are probably enough to get it through the night. Boiled or scrambled egg cut into very small pieces will work if it's hungry.
edit: saw you have no eggs. Soak some dry cat food in warm water until it's soft. Not the best diet, but will work in a pinch.
edit: saw you have no eggs. Soak some dry cat food in warm water until it's soft. Not the best diet, but will work in a pinch.