What is the best material for drinking water in a cup?

1 glass cup. I'm using a glass cup now. Usually the raw material is high borosilicate glass, which is fired at a high temperature of more than 600 degrees. When buying a glass cup, you should choose one with smooth surface, no impurities, no bubbles, no peculiar smell and no tilt of the bottle body. Glass contains no chemicals, so drinking glass water is the safest, recommended by 5 stars.

2 plastic cups. It is the most common quilt, which is not fragile and easy to carry. Plastic products have a digital logo, 1-7. The water cup we usually drink is usually No.5. No.5 plastic has the characteristics of high temperature resistance and is not easy to produce toxic substances, and others are not suitable for use as water cups. However, it should be noted that some water cups are size 5, but the lid is not, which will also produce harmful substances, so be sure to look carefully before buying.

3 purple sand cup. This kind of water cup is generally used by more people to make tea. Purple sand is very breathable, tea is not easy to smell, tea is not easy to deteriorate, and a good purple sand cup can also show a person's taste and identity.

4 stainless steel water cup. There are many brands of water cups made of this material, all of which are big names. Stainless steel cup, durable and elegant. They are used as thermos cups and are harmless to the body. But it can't be used to hold traditional Chinese medicine, which is harmful to the health.