Yes, I am putting about 1/2 tsp into 24oz, but this is just the electrolytes. This with a little flavoring, such as trulemon, makes this a substitute for things like Nuun tablets, which are just water and electrolytes, no calories. This is the context in which this thread was started.
For drinks with carbs in them, I will add some gatorade powder and sucrose, in addition to the electrolytes. There are also some electrolytes in the gatorade, but I generally use below the recommended concentration of the Gatorade powder so this is a small enough amount that I don’t account for it.
Regarding safety of potassium chloride, I can’t comment on that. It is sold in shakers as a salt substitute, and from my notes SIS tablets provide the potassium from potassium chloride, so I am comfortable with the amounts used in hydration products. Sodium is by far the most important ingredient from what I understand, so in practice there is likely little to no benefit from adding the potassium.
I think this thread: Fellow indecisive people... some useful perspective on decision making
explains a lot about why I made this recipe more complicated than required 