As summer approaches, we will need to receive hydration frequently.
At such a time, a water flask is useful because of its portability.
I think some people put isotonic drink or juice in the water flask.
Such drink containing salt and sugar is effective to heat stroke, but if the water flask is made of metal like aluminium or stainless, please be careful.
Most of these metals are easy to react with acidic liquid such as isotonic drink, juice, carbonated beverages.
In particular, coke have really high acidity, and it easy to melt metals.
If we drank these beverages containing melted metals, we will be poisoning.
Therefore, please do not put beverages except water in your water flask.
