Well, if you’ve ever ground up some sea salt on your eggs you’ve eaten Calcium Chloride and, of course, sodium chloride. But Calcium Perchlorate will kill you in like eight different ways and also make it really difficult to grow potatoes... just saying.
So when we say that the water on Mars is salty and that it’s a brine, we don’t mean that it’s like our ocean. It’s salty in that it has a very high concentration of an ionic compound...and that ionic compound is very much not sodium chloride, the stuff that we call salt.