We have noticed that bottled water is not allowed in the security check. The security people will confiscate the water bottle and throw it in the trash can. But after the security check, there are stores that sell food and drinks and also bottled water. Isn't it crazy that they disallowed our bottled water so we will buy in the inner stores? No, definitely no. The bottled water that we bring may have a chemical and the security people wouldn't waste time to check the contents of the bottle. For simplicity, they just prohibit the entry of such water bottles. You can buy it inside anyway, for a cheap price.