The two most important points of drinking water are sanitation and sufficiency. Meet these two conditions, as long as it is normal temperature water, it is healthy.
The reason why room temperature is said is mainly for some particularly hot water (including drinks and soup). Drinking too hot water for a long time will increase the risk of esophageal cancer, such as kungfu tea. However, most people don't need to worry too much about hot water. Drinking water with an average temperature of 30-40 degrees is no problem. You think it is better to drink hot water in the future.
The same is true of ice water, as long as it is hygienic, it is not a big problem. Everyone's living habits are different, as long as you don't feel uncomfortable drinking. People who say that drinking ice water is unhealthy can look at two countries and regions with the highest life expectancy in the world, one is Japanese, and the other is China and Hongkong. Many people have the habit of drinking ice water.
Generally speaking, as long as it is not particularly hot water, hot water, warm water and ice water are neither healthy nor very healthy. Just choose your favorite temperature, regardless of what others drink.
Just drink water, don't give unrealistic health wishes.
But in today's peacetime, we have a good tap water system and various water filtration equipment. Boiling water can still disinfect water, but it is really unnecessary. Japanese women also drink ice water after giving birth, which does not affect the average life expectancy and ranks first in the world for many years.
So, as long as you don't get upset by ice water, drink ice water if you want. No problem.
Of course, occasionally people will drink ice water, cardia tear and myocardial infarction. But I noticed that these people have an extreme situation when drinking ice water. For example, after exercise and a lot of physical labor, patients drink a lot of ice water in one breath. Although these extreme cases are rare, I suggest that it is safer to drink ice water here.
As for hot water. Just don't drink hot water. People who like and want to drink can still drink. No problem.