Hot Water Bottle

Every night when I got to bed, my husband follows about 5 minutes later bringing me two bottles of water. Just lately, now the nights are colder, he also brings me a hot water bottle. And every night he makes the same joke. "Oh no! I've got it the wrong way round. I've put hot water in your drinking bottles and cold water in the hot water bottle." It was only mildly amusing the first time. After a week it's now wearing a bit thin. Add I've got all winter to get through.....