2, the precautions for buying water cups are: pay attention to the water storage capacity of water cups: some water cups are opaque or have two layers, and may not look so much water, so you should read the instructions yourself; Pay attention to the scope of use of the water cup: the maximum temperature that can be withstood by different scope of use is different. The recommended temperature of general drinking cups must be higher than 100℃; Pay attention to the heat preservation effect when buying water cups, especially sports water cups and cycling water cups. These insulation requirements will be higher, so be sure to look at this insulation performance carefully.