Generally speaking, bottled water, whether expired or unopened after opening a bottle, can be considered for drinking as long as it has not expired for too long. The shelf life of bottled water after opening is 15 days, so it is best to drink it within 7 days after opening.

It also depends on whether bottled water is placed in the open air (in the sun for a long time). Generally speaking, the barrels of bottled water are PET (polyethylene terephthalate) and food-grade PVC (polyvinyl chloride). Without high temperature, the barrel itself will not melt and decompose, and it is non-toxic and tasteless. Therefore, after bottled water expires, the barrel itself will not decompose, resulting in mineral water containing toxic substances.