He takes the canteen but pauses, and says, carefully, "You knew my name, without me introducing myself, before."

Granted, he'd never figured out how exactly Master Kenobi knew who he was. But he can't fathom what reason Obi-Wan would have to pretend not to recognize him, now.

His gaze darts around, and he flings his senses even deeper into the Force, searching for some hint that this might be a extremely vivid vision, or a trick, of some kind.

Everything seems solid. Real. Passingly familiar.

He turns his attention to focus more intently on Master Kenobi, as he slowly takes a sip of water.