Really, he'd do better using that box as a smoker and curing the meat for travel, since keeping it in the fridge will only preserve it for so lo-- no, wait, that's not the point here!

He'll get to the other questions in a minute -- the most pressing need is the worm that he's not sure he can watch the younger Vash chow down on without being sick.

"I've never been much of a fan of worm myself, ah ha ha!" Which is putting it mildly! They're emergency food for a reason -- just like sucking on a small rock will trick the body into creating saliva and keeping his mouth wet when he runs out of water, sucking on a worm will trick the body into thinking he's not starving to death. The flavor isn't something he can recommend, though. Maybe with a lot of gravy? "You must really enjoy it!"