Twenty years after her family became seriously ill from a water-borne parasite, Christine Greer still doesn’t trust what comes out of the tap. The family of four were among an estimated 7,000 people in North Battleford — about half the city’s population — who spent the spring of 2001 incapacitated by severe flu-like symptoms. “I shared a home with my nephew and his wife and my great-nephew,” Greer, 47, recalls. “Even the baby was sick, severely sick. It was a little bit traumatic.