tenaciously

Hi guys, new to the forum here, but I am in desperate need of some help. I have a drug test (urine only) that I will be taking to work for US Cellular, and they said they will give you a 48 hour warning. Here are my stats:
23/female
fat, ie: 200+ pounds
height ~5'6
metabolism? I'm assuming very slow/weak
using rate: chronic (2-6 times a day) but I haven't smoked in 5 days.

I have not yet been given a date for my drug test, but I think it will probably be Wednesday at the earliest, which means I will have not smoked for 9 days.

I don't have enough money to buy any of those fancy drinks, but I've been drinking a ton of water every single day and just bought some cranberry juice. I've been scouring the internet for advice, but all of it just gives me more anxiety, so I want some help/advice/prayers!

Should I get niacin? (pill form, red bull?)
What can I take to make my pee not look like all water when I take the test and piss clean?
What else can I do? Or is it inevitable the I will fail it considering my stats? Please help me !!