Do you have access to Pet Store this weekend? Usually these places will sell kitten milk replacement formulas, so that Houdini would be able to supplement the kitten food with some milk. But he should be okay with the diluted kitten food.

You might also want to try playing soft classical music in the room where he is. As they say ... music calms the savage beast (and he might qualify)

Good luck and I suspect that he will worm his way into your household in very short order