Always, always, ALWAYS do more than one take. Always.
To expand upon feeding the crew, take care of the people working for you. If you can't pay them, then at least try to compensate them in some way. Make sure they get a copy of the movie. And remember that they're working for free. Unless they asked if they could be in the movie, they're doing you a favor.
Sound. I'd give you some specific advice about sound, but it's all important, so I'll just say "sound"
Funny you should say that, when we were shooting Odyssey, that's where we ate.