Kids sick from antifreeze

Children at a Queens school became sick after drinking water that was apparently contaminated with antifreeze.
This raises some questions:
Why were they drinking plain, water fountain water? I thought everyone drank sodas or bottled water and juice.
Why was a fluid used in the air conditioning system in the drinking water pipes? (Union plumbers perform repairs at schools, but a "contractor" was blamed.)

Well, as long as they stay away from Obama's cool aid, I'm good.