"Um... remember this?" He leans over to one of the supply boxes strewn over the deck of the boat, and rummages around in it for a bit before producing his empty water bottle. He mimes drinking from it, something Joker had certainly seen him doing now and again before it ran empty.

"The water in it was... different." He emphasizes that word, carefully, halfway for Joker's sake and halfway as he considers how to elaborate on that. Just the fact that he can't live surrounded by water isn't quite enough to get across how it is that he can be dehydrated out here.

Eventually, he sets his bottle down and leans over the edge of the boat. He holds out an arm, uses his thumbnail to scrape at the layer of salt that's encrusted on his skin from the air and water all around him. "This is salt. It's... very dry. And it's in the water."