My new hamster won't drink?

So, yesterday I bought a hamster. He's active and really friendly, not shy at all. He'll eat, but he hasn't drank any of his water from the bottle yet. It's been over a day now, and I tried showing him how and putting it near him, but he still won't. Is this bad? I've been giving him celery&carrots to keep him hydrated. Should I put his water in a bowl and let him drink it like a cat/dog would? Is it just because he's new?