Walmart and several global beverage-makers have pledged to deliver about 175 truckloads of bottled water to Flint as the Michigan city deals with a public health emergency caused by lead-tainted water. The retail giant, along with Coca-Cola, PepsiCo and Nestle, announced Tuesday the collective donation will include up to 6.5 million bottles of water through December for at least 10,000 schoolchildren.