CNN  —  As the sun rises over Kabul’s parched mountains, a family’s daily struggle to find water – and to make it last – is about to begin. The sound of water tankers rumbling through Raheela’s neighborhood in the Afghan capital prompts the 42-year-old mother of four to rush out to the street to fill her family’s battered buckets and jerrycans. The family’s supply is always running low, she says, and every liter is expensive, stretching nerves and their budgets to breaking point. “We don’t have