We should have one word to convey the idea of "dying of thirst." Nobody has to say he's "dying of hunger," because he just says, "I'm starving." So why don't we have an equivalent for thirst?
My ill-conceived suggestion is "dehydromort." And since we don't make irregular verbs anymore, I think this one should conjugate as dehydromort/dehydromaert/dehydromurt. So the latest version of "Oregon Trail" will have a screen that reads, "You have dehydromurt."