1, glass is the best drinking cup. Glass has always been the safest material for quilts. Ordinary glass is made of silicon dioxide and has stable properties. It contains no organic chemicals in the firing process. When people use it to drink water or other drinks, they don't have to worry about chemicals entering the human body. Moreover, the glass surface is smooth and easy to clean, and bacteria and dirt are not easy to breed on the glass wall, so drinking water with glass is the healthiest and safest.
2. Metal cups. Metal cups are actually very common, and most of them are used as thermos cups. The cup made of this material is thick to the touch and heavy to carry. If you want to save hot water, this cup is the best choice. And inferior stainless steel, chromium, manganese and other metals that will seep out will have adverse effects on the human body. So be sure to buy food-grade stainless steel (such as 304 steel) or medical stainless steel (such as 3 16 steel) water cups.