. . ."   With the candor and often hilarious outlook that have made her a beloved commentator on NPR, Marion Winik takes the reader on an unforgettable journey through modern parenthood, with all of its attendant anxieties and joys.        A single mother with two small boys, Winik knows exactly what she's talking about, from battles over breakfast and bedtime to the virtues of pre-packaged food and weightier issues like sex education and sibling rivalry. Part memoir and part survival guide, The Lunch-Box Chronicles is an engaging philosophy of parenting from a staunch realist, who knows that kids and their parents both will inevitably fall far short of perfection, and that a "good enough mom" really is, in fact, good enough.