Well, in this situation, I think I would probably now just head straight to the airport and fly to another country, to get out of Singapore. Doesn't matter what country.

If Singaporean police come after me in another country, which country would be an Asian Switzerland where I could stay in limbo without fear of being deported?

And to the other poster, I don't think you could flush it down the toilet as then you would "know" about the drugs and would have touched them with your own hands. And what if the drug were found in the sewers having came from your hotel room?