Just note the label, "Not for human consumption" :no
If I were the wagering type, I'd wager an air fill that that designation is there so they don't have to go through the expense of the whole Nutrition Facts label.
Hmm... so, swish with "Reef Crystals", then rinse by swishing some "Instant Ocean", wash that out with kitchen-made salt water, flush with normal saline, and top it all off with a cleansing bottled or tap water. You'll have made the trip all the way through all the environments you're likely to encounter. (If diving in the Great Salt Lake or the Dead Sea, additional drills may be required.)
Completely seriously, though, if seawater is really unpleasant and "dive more" isn't an option, gargling some salt water here and there to help build a tolerance may be worthwhile. It seems rather apparent that people who expose themselves to seawater regularly get over it, and feeling sick or having an overdeveloped gag reflex isn't what I'd want to encounter on a tropical vacation.
By the way, according to many of the instructors, shop guys, and others I've listened to (and with whom I agree), seawater tastes... er... "wetter"?... than fresh. In other words, in a freshwater spring you might not even notice a tiny pinhole in your mouthpiece, but in seawater, you'll *really* notice it. (It can feel like a flood, but if you're still getting plenty of air, you just blow the water out through the regulator and figure out the problem later. If you swap to your alternate, however, it's a good idea to thumb the dive -- you probably wouldn't want to hand a wet-breathing reg to an OOA diver, after all, would you?)
