Is it harmful to drink water from a common aluminum liner kettle?

Don't worry, as long as you are not burning vinegar (or boiling alkali), aluminum ions are not so easy to enter the water in large quantities.
First of all, aluminum is a very active metal, so the outermost layer of the aluminum products we use is not aluminum, but a thick layer of aluminum oxide, and aluminum oxide is very stable under neutral and weakly acidic (weakly alkaline) conditions. For example, the main component of ruby ​​and sapphire is aluminum oxide, and aluminum oxide also accounts for a large part of the soil composition. The tap water we usually drink is neutral and slightly acidic, which will not release aluminum ions in aluminum oxide.
Secondly, we know that aluminum ions are a metal ion that is easily hydrolyzed. Heating and carbon dioxide dissolved in water can cause aluminum ions to produce aluminum hydroxide precipitation, so even if aluminum ions exist, it is difficult for them to exist in large quantities in water.
Again, aluminum is one of the most abundant elements in the earth's crust and exists in large quantities in nature, so there is no need to be afraid of aluminum. As long as you use aluminum products normally and do not use them to hold acidic or strongly alkaline liquids for a long time, these aluminum products are very safe and the extremely small amount of aluminum ions they leak out will not cause harm to the human body.