If you plan to dilute on test day, start taking Creatine supplements a few days before you actually test to allow it to turn into creatinine, your body's bi-product. It is my understanding that the creatinine levels are one of the things that they test for when looking to see if you diluted or not, so raising them is not too bad of an idea in your case. They also look at PH balance, so you're going to need some salts to counteract the dilution. I recently took a test myself at Labcorp, and I believe everything came back clear (no news is good news), and I tried chicken broth as one of my dilution liquids to help my PH level stay normal, along with some Rolaids. Hopefully, you won't need to over-dilute... probably just a little, considering your infrequency. I recommend shelling out the extra $15 on another test (or maybe two). It helps to clear the jitters when you test clean on your last pee before going to the testing site. Most of this stuff here was tried from a dilution thread that's recently floated down on the board. You might want to read it... good stuff.