Read The Label

So, did you hear the one about the two women who set sail from Hawaii on a three hour week trip to Tahiti, and got rescued of Japan five months later?

Two women rescued after 5 months adrift in the Pacific - CNN

This being the 21st Century, the story started unraveling rather quickly.
Questions raised about sailors' story after months stranded at sea

The best analysis is found here: 19 REASONS THIS “SURVIVAL” STORY SMELLS FISHY – UNREASONABLY DANGEROUS ONION RINGS (h/t Insty.)

Aside from the fact that I may have to start reading the Unreasonable Dangerous Onion Rings blog just for the name, this is essentially a detailed fisking of the entire story. In this case, go ahead and read the comments. (Note: If you're going to click through to the Daily Mail's coverage, you might want to warn your spouse lest she look over your shoulder when you reach the part about how one of the principles in this story led a "Shades of Grey" lifestyle. AMHIK.)

Anyway.

What brought me here was that, out of curiosity, I looked up de-salinators on Amazon, because, 5 months at sea you'd obviously have to have one.

The search returned 29 hits, most of which are filters or purifiers, not de-salinators.

Removing bugs and contaminants from salt water doesn't do you much good if you still can't drink the water...

Anyway, two rules:

1. Always read the product description. 
2. Never read the comments. 

Exception to 2. above:

• Unless you still have questions about the product description.