Pet materials. Nongfu Spring official website information shows that the bottle (non-glass) of this brand of mineral water is made of PET. Nongfu Spring, namely Nongfu Spring Co., Ltd., formerly known as "Zhejiang Qiandao Lake Yangshengtang Drinking Water Co., Ltd.", was established on1September 26, 1996, and the company is headquartered in Hangzhou, Zhejiang Province.