Read the substitution sticky. You can get a friend's urine (if they are clean). I don't believe a bottle of Strip NC and cranberry juice will help. You said you have been a heavy smoker for a long time and you smoked last Tuesday. I'm a heavy smoker and I could not pass a hometest using full dilution after 14 days. I did pass with dilution around day 28 but I still subbed because I couldn't pass my first morning void. Everyone is different, but a heavy smoker and 3 days clean is a little scary.

You need to hand the sample to the tech between 94 and 99 degrees. Read the sticky and it will help you pass. I don't think dilution is an option for you.