I drink about a 14 to 16 beers a day. What can I do to pass the unirne test the next day?

STOP DRINKING !!!

There is NO way you can consume THAT amount and even hope to pass a test the following day.

You can't and won't ( and should not) till you stop drinking.

You have a serious problem, and perhaps losing what ever you risk with the test may be a wake up call

14 to 16 beers a day? OMG! I can't even have to a day without feeling ill.

Obviously they're testing you because you have a serious problem. How do you pass? Well, you stop drinking. That's the only way.

Have you considered rehab for your addiction?