>>21469006 (OP)Most are just sugar water with a dash of potassium salt added - plus artificial flavor and coloring.
Your body should be telling you if it needs more water or more salt. Most people ignore their body's hydration signals though because of habits. But it's super obvious when you drunk a bunch of water and your body wants salt - you will be craving salty snacks. These are good when you are in that particular state. When you aren't, especially in the "need water" state, these really need to be thinned down to get you the water you need.
The best ones have a tiny amount of sugar (like 4g or less). Just enough to help water absorb, but not so much you pack on the pounds thanks to 200 cal of sugar added.