Where can I buy cheap glass water in Jinnan District of Tianjin?

Jinnan District built a new city, Xinwanhe Square. Zhongdi Auto Repair & Beauty Chain (Balitai Store) 1.8L2 bottles of 9.9 yuan and Tmall Auto Maintenance (Li Shuang Road Store) are 29.9 yuan. In contrast, Zhongdi Auto Repair Beauty Chain (Balitai Store) is cheaper. According to Baidu map, it is located in Xinhe Square, Jianxin City, Jinnan District.