2. Pure water, namely distilled water and space water. All harmful and harmless substances and elements are removed. Suitable for making tea. Simple long-term drinking is potentially harmful, especially to the elderly and children. Drinking more is not recommended.
3. Bottled water. Uneven quality, easy to secondary pollution, choose carefully.
4. Secondary filtering tap water, that is, tap water that has been treated by the waterworks and reached the standard. But after reaching the faucet through the water pipe network and water tank, there are also some impurities and bacteria. It is recommended to drink after boiling. This kind of water is convenient and economical.
Tap water filtered by water purifier or water purifier is the healthiest and safest. However, it is necessary to invest in the installation of qualified water purifiers. Pay attention to the following points when drinking water. Don't wait until you are thirsty. Don't drink expired water. No water in winter, no ice water in summer.