It's a marketing ploy by the Bilderberg group and part of a larger plan to enslave mankind. Mineral when exposed to oxygene water has to be drunk within a certain time frame otherwise the chemicals in it that facillitate the acceptence of tracking chips by the human body go bad.
Probably for the safety of the hospital staff and I think the staff take an oath about maintaining standards (they probably work hospitals too) so best they keep consistent I guess.