Large trucks and buses roll through the only paved road connecting Dakar to Bamako, transporting passengers and merchandise to villages along the way. Every 50 kilometers or so, those trucks and buses stop – drawing women and children out from behind their red earth covered tables and roadside stands carrying bags of water in a bowl on their heads. In most of these towns, these bags of water are the only way to keep people safely hydrated since potable water is not common.