8 days and counting need guidance

I have been a long time user for many years 3 grams per month on average. 6'0 200 lbs..50 years old. Found out I'm being tested on friday 7/31. Have not used since 7/20. I was on vaction in mexico this week did not smoke but drank alot of beer, margi's and such this week pee'd and sweet quite a bit. I have been drinking alot of water as well. Any adice if I should detox or try to sub. I am really worried about subbibg as I do not have a doner. I took a home test this morning (first pee) and tested positive (though I thought there was a VERY faint second line).

Really worried.....I don't want to loose my job over this invasion of privacy. I might be able to pospone it a week at best but I am not sure if even that would help.

Feed Bacl id appreciated....

You can always sub using sythetic urine. Follow the sticky. Also you can try dillution. You have time so read the sticky and practice. Leave out the aspirin its outdated and only load up on creatine 2-3 days before your actual test. The day of the test substitute gatorade for water. Remember the goal with dillution is not to be totally clean but to dillute your specimen to the point of passing the cuttoff, usually 50ng/ml. If you are almost passing with your morning void, your chances are ok to pass with dillution by 7/31.