Here's a fantastic soup recipe:
http://honest-food.net/2014/01/21/turtle-soup-recipe-creole/The putting it in the tub to clean out for a couple of weeks is dead on the money.
A bit more on them:
http://simplegoodandtasty.com/2013/09/29/hunting-for-dinner-snapping-turtles-and-general-tsos-turtleThey don't die easy. That I know for a fact. My father still kills and cooks them, as did his parents (and their parents) before him. He has an old bathtub out back just for holding turtles for a couple of weeks while they get flushed out clean. To kill them, get them to bit a stick (not hard to do), hold them up by that stick and with a VERY sharp large knife, machete, or hatchet, sever the head from the neck in one swipe. Turn the turtle upside down, tie the hind legs, and hang like that so it can drain out for at least an hour.
