What is the healthiest hydration drink?

I'm curious to know, what exactly constitutes the healthiest hydration drink? Is it simply water, or could it be a combination of water and electrolytes, perhaps even infused with fruits or herbs? Are there any specific properties that make one drink more hydrating than another? And are there any potential drawbacks to consuming certain hydration drinks, especially in excess? I'm eager to learn more about the science behind hydration and how to make the best choices for my overall health and well-being.