Dog flu serum
Looks like a perfectly good dose of serum. I guess it'll come in handy if you come across anyone with snout fever.
Binoculars
These provide a great view down the Darjeeling tracks. You stand at mile marker 20. Looks like everything proceeds straight ahead until mile marker 14, at which point a second line comes in and there's a switch in the tracks. Also, looks like there's a small station at mile marker 16. Down at mile marker 12 the two tracks merge into one. That's about as far as you can see.
Schematics
Looking over these plans, and they seem to indicate that botching the next challenge, just completely misfiring, might actually provide a small personal benefit for a limited number of players if they can find a way to reuse those bullets.
Team Zissou rings
First off, you're going to want to put one of these bad boys on immediately. Team Zissou! Okay, now, at the time of your choosing, you may offer the other ring to any other player. Just post in your confessional when you decide to give it to someone. They'll need to post that they're accepting the ring in theirs. Then you're both members of Team Zissou, which means you cannot vote for one another. This will be true up through and including the final five.