I would sit down with your son and daughter now and talk about what is happening. You don't need to force feed adulthood on them, but children need answers to questions we adults ignore or fail to see. Involve them in your planning. A power out drill and a test meal from your supplies( and forget the sterno, get some manner of small stove) will make the unfamiliar, the irregular a little more familiar, more regular in their impressionable minds.