Drinking always makes things worse.
But, you can use this to your benefit. The key is that next time you're cravey, you have to remember that if you have even just a sip, you're going to be back to where you are now, feeling like you've lost your progress.
The good news is that you haven't entirely lost those three days. You learned from them. Now, you know and all of us here know that you are more than capable of going three days. And now you've learned how you DON'T get to 4 days. Which means, you have the option of trying a NEW way to get to 4 days.