What's your tolerance like and what are you using? Is there anyway that you can take hydrocodone or kratom or suboxone or fentanyl for the next few days? I'd assume you're taking a simple 5 panel UA but even if you're taking a 10 or 12 panel, suboxone, kratom or fent won't show up. Hydrocodone also usually doesn't show up in UAs.
I've always heard and read that those detox drinks are bullshit and don't really work. If that's your only option, I'd buy one that mentions keeping your creatinine levels correct and drink the detox drink and a shitload of water for the 24 hrs before the test especially the last 6-8 hrs before the test. That way, you'll at least get your levels lower and hopefully below the cutoff level for whatever drug you've been taking.
What's currently in your system? Weed or pills or powders or what? Give a little more info so I can give better advice.