Water with lots of sugar is wrong, when your body needs water.
So drinking water and a sip of cola is fine, but drinking cola against thirst has side effects as you need water to process lots of sugar.
So drinking water and a sip of cola is fine, but drinking cola against thirst has side effects as you need water to process lots of sugar.
Consuming plain water during really long endurance events can cause hyponatremia. Not recommended. But for the short 10k and under running events that most of us do, it doesn't really matter much.