"For real?" This was... salt water? Actual salt water? Then that meant—this was an ocean? Eren immediately collapses to his knees with no regards that he was dirtying his clothes on the wet sand at all, disbelief written all over his face. "You're kidding."

He doesn't wait for Armin to respond, though, as Eren also cups a hand into the frigid waters (and takes a second to suppress the following shudder), then cautiously brings it to his mouth. While he doesn't shove the small handful into his mouth as eagerly as Armin had, having a slight idea of what was to come, Eren isn't exempt from a disgusted look of his own.

He wasn't kidding. This stuff tasted gross. And yet... "No way—it really exists."