In humans it is widely known that when lost at sea you will die if you drink salt water (due to the inability of your kidneys to excrete a stronger salt concentration than sea water). Less widely known is that you can take a ’sea water enema’ and survive. The colon has active transport of water (to solidify feces) and can extract fresh water from sea water. I know of at least one scandinavian family lost at sea that survived using this trick.Luckily the D-blog always has an enema-bag about his person (don't ask), so next time he goes on a cruise (the D-blog has never been on a cruise), he'll survive if the ship sinks--at least until the others in his lifeboat kill (and eat) him for administering himself enemas right in front of them. Mmmmm, salty.
Update: Fucking Scandinavians.
Update II: No sharing!