Is it still safe to drink water after mixing ice cubes with hot water?
Ice cubes and hot water can generally still be consumed if they are safe, hygienic, and at an appropriate temperature after mixing. If there are hygiene concerns, it is generally not advisable to drink the mixture.

If both the ice cubes and hot water come from clean and safe sources, the mixed water may experience temperature changes but will not produce harmful substances. In such cases, the mixed water is safe for drinking. This practice is commonly used when preparing cold beverages or adjusting the temperature of drinks to achieve the desired taste and temperature.
If the source of the ice cubes is unknown or they were produced or stored in unhygienic conditions, they may carry pathogens such as bacteria and viruses. Similarly, if the hot water does not come from a clean water source or has not been adequately heated to kill bacteria, the resulting beverage may pose health risks and should not be consumed. Drinking such a mixture may lead to gastrointestinal discomfort, food poisoning, and other health issues.
In daily life, it is recommended to maintain good personal hygiene habits, such as washing hands before meals and after using the toilet, and drinking clean, safe water, which contributes to overall health.