Hmm yeah dunno it was something she said to me growing up, that she had combined these 2 things that are really harmful and made salt and then they made her taste it...might have just been one of those 'older sister' stories.
I imagine one could use electrolysis perhaps as an alternative for separating the sodium and chlorine, and then react them together under verycareful conditions? Surely you agree it is theoretically possible to react sodium with chlorine to make salt?
Is your lesson to me that the only naturally occuring place for sodium and chlorine is in seawater? If that's the case I wasn't aware of that... I would have imagined there would be other naturally occuring compounds featuring sodium or chloride.