most profound experience i can have. >> o'donnell: flu season warning: why health officials are so worried. could we see a twin-demic of flu and covid. contaminated water: another michigan town with unsafe lead levels, endangering children for years. >> reporter: what water do you use to cook? >> the bottled water. >> reporter: to brush your teeth? >> bottled water. >> reporter: bathe? >> bottled water. >> o'donnell: guns at airports: a record number of people trying to bring guns through security. which cities have the most culprits. cutting out salt: what the new f.d.a. guidance could mean for your favorite chain restaurant. and special assignment: a new recruit. helping capitol police heal. ♪ ♪ ♪ this is the "cbs evening news" with norah o'donnell, reporting from the nation's capital. ♪ ♪ ♪ thank you for joining us. we are going to begin tonight