 Manhattan has millions of people, and they use lots and lots of water. But what if that supply were cut off, just for one day? It s that thought that launches Eddie on a creative essay on the consequences of no water. Certainly it would create lots of problems for Eddie s Aunt Rosa and his friends Vincent and Johnny. What s worse. it would be a really "bad hair day", especially for the roving reporter (Nancy Glass) who is covering the story. Miss Toliver, of course, would see it as a wonderful teaching opportunity for a lesson on volume measurement. But it would also give Eddie a chance to meet the people who build water tanks, reservoirs, and huge underground tunnels to supply water to the city of New York, making sure that the only way Manhattan will ever run dry is in Eddie s imagination.