Take a breath. The blue in the toilet water is so you can't use the toilet water to dilute the sample after urinating in the specimen cup. Toilet water isn't the smart way to dilute a sample anyway because of temp and specific gravity.

Save your money on the detox drinks/pills and buy synthetic urine and sub. Read the sticky. If you don't want to do that which is really the best and most reliable method because pre employment tests aren't observed unless you give them cause then read the dilution sticky. Drinking massive amounts of fluids is useless except for the day of the test.