well just drink some fluids and take a couple b2 vitamins, and you should be fine since you haven't smoked any, or very little. Senthetic urine is the way to go if you have the time. assuredprivacy.net is a great website. They have with overnight delivery, but it's expensive I imagine. For a bottle of senthetic urine it cost $20+ shipping, and I think it comes with a couple hand warmers and a stick on thermometer. Anything over 93 degrees should be fine, but the closer to body temp the better. But it's good stuff to have around for sure. It has a high shelf life, and they say it will last up to a year an a half in unidealistic conditions like a glove box in a car for example.