Follow killers advice. If youve been testing clean at home this long you will be fine. 30 oz of gatorade is dillution, but not enough to get a diluted reading. Plus it adds electrolytes. No need to go to the lengths of N2's post or use a "sure pass" drink if youre testing clean b4 hand. And I have asked this question b4 and was told e-bay strips are just as dependible as wal-greens. I made sure to buy the ones on ebay that said fda approved, but I doubt that really matters. I ordered mine on E-bay on the 25th and I think I will be getting them on the 28th.