Why does mineral water that has “trickled through mountains for centuries” go out of date next year?

Happy Luminaire <3 ~Ingrid the Inquisitive Elf

d'aww and i didn't think i was getting any presents this christmas ;_; thank yoo n.n.

and to answer your question little elf i think it's because they put loads of icky chemicals in it to filter the purity where as river water has all the gritty sandy stuff in from riverbank erosion.