NITA BHALLA and MOHAMMED OMER NEARLY three-quarters of Somali families lack safe drinking water as drought looms across the country and depletes wells, raising the risk of hunger as crops fail and livestock dies, UK-based charity Save the Children said on Monday. Climate change is taking a heavy toll across eastern Africa, and increasingly erratic weather - from recurring droughts to floods - is becoming commonplace in countries such as Somalia, Kenya, Uganda and Ethiopia. In a survey of more than 630 households in eight of Somalia's 18 regions, the charity said a dearth of seasonal rain last year had…