A person / animal needs hydration and nutrition. If there is anything in the water, that's what I'd basically call dissolved food or nutrition.
Electrolytes are a common thing to find in say sport's drinks, but they are there to replenish the minerals lost with sweat. Actual nutrition / sustenance is just meant to be mainly energy and proteins to rebuild muscle to keep you alive and strong in general, then the minor things would tend to the health of separate organs or bodily functions. A lot of trace elements and vitamins.
Anything considered more healthy than water would IME either be food (think oats or proteins like in a shake), supplemental compounds like the vitamins etc, nootropics or other 'health' drugs with some claimed health or performance benefit - though performance is often not the same as health, and even goes at the cost of it...
If you know what makes you less than 'perfectly' healthy, you could add something to your water or food that targets what appears to be wrong with you. Think milk thistle for the liver.
For a very healthy person I'd say isotonic drinks are best, or just water if your food is sure to contain plenty of minerals. Perhaps for an aging person the healthiest thing is that drug that kills senescent cells in mice, but that is not proven yet for humans.