I had just one 12 ounce bud light 77 hours from my EtG test tomorrow. I've worked out, drank a lot of water, etc. Will I pass?

Depends on just how much water you drank... you might have increased your chances for failing on a dilution.

It's tomorrow night. Drank a lot today, but will decrease tomorrow. Have you taken these tests?

Doesn't matter (incidentally I have been subject to random workplace testing for 30 years)... put 10 people in a room that were drinking equally... and they won't all have the same exact results. Because metabolism rates vary from person to person.

The best way to fail on a test even if you weren't drinking at all... is drinking excessive liquids... because a dilution is an automatic fail... and something they ALL look for as its a common attempt to cheat a test.

One beer and 77 hours tells me you will likely pass. BTW who gives a ETG test that is scheduled in advance?

If you don't overdo it with the water, your chances of passing after 77 hours and a single drink are very high.