The charming book “Swim to Me” by Betsy Carter is set in lovely Weeki Wachee Springs, Florida. Delores Walker leaves the Bronx and moves to the City of Live Mermaids, where she meets up with other hopeful water people. There, she transforms into Florida’s most improbable celebrity, Delores Taurus. This intelligent and moving story intertwines the impossibility, dreams, and family even Bronx mermaids.