Some piece of very modern technology that floats. I think Wilson in the movie represents Hank's character's last grasp at a shred of civilization, so he holds onto it as hard as he can. My first idea was an e-ink tablet with an author's face on it, but that's a little too on the nose. Maybe it should be something that reflects how much more reliant we are on our modern conveniences than we were during the original.

Edit: Raycon earbuds. He calls them Ray and if you're lucky that might also bring in some sponsorship money