Not all types of water are safe to store in thermal containers. Some types of water when exposed to stainless steel or bottle materials for a long time can change the quality, even affecting health.
Carbonated water and alcoholic beverages are the first group to avoid. According to food safety experts at Cornell University (USA), CO2 gas in carbonated soft drinks or beer can increase internal pressure, leading to leakage, deformation of the lid or even the lid being turned off when opened. In addition, alcohol can also react with compounds in the dressing of a bottle, reducing the product's lifespan.
Acidic fruit juices such as oranges, lemons, and grapefruits should not be kept in the thermal container for long. The acid in fruit juice can erode metals, releasing heavy metal ions in small amounts, while creating a favorable environment for bacteria if left for long periods of time, says Dr. Benjamin Chapman, a food safety expert at North Carolina State University.
Milk and dairy products are also on the "ban" list. Due to its rich protein and fat properties, milk is prone to spoilage if kept at room temperature for many hours. When kept in a sealed thermal container, the milk can quickly ferment, producing bacteria and creating gas, which is dangerous for the user.
Experts recommend that heaters are the best choice for water, tea or coffee to drink during the day. Users should clean regularly, avoid leaving drinks overnight and do not fill the bottle with water to reduce pressure.
