Equation about alcohol pee test, particularly ETG I think

So good news is I’m not on probation and in rehab for Benzos voulentarily. It’s out patient, but I’m not supposed to have alcohol. I told my doctor I started to drink again, and she wasn’t mad or threatened to stop tapering me, but I’m wonder if when they send the piss to the lab if they will see the ammount I drank. It takes them a week to get back, and I’m hoping if I chug a shit ton of water before the test the levels will show as low. I’m pretty drunk, test is in 4 hours