One of the best and also least expensive synthetic concentrated urine samples can be found at whizzinator.com for only $12 ! A couple of other highly recommended ones are Dr. John's Famous Pee Pee from urinator.com or the one from cleartest.com which includes everything you'll need, the bottle, temperature strip & heat packs. Another good one is QuickFix 4.0, which comes pre-mixed.
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The Original Whizzinator - PRODUCT - Pass Your Drug Test!
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the urinator
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Concentrated Urine - products for beating urine drug tests
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http://www.urineluck.com/product_details.cfm?id=1
You don't really need to get the actual whizzinator prosthetic or urinator or gonumber1 "spare bladder" devices, because you can easily make your own using a simple 2 oz bottle like this one pictured below, or even just a regular condom.
If you use a condom, be sure it's non-lubricated and rinse it out. When filled, you can either just twist & bend the open end back on itself and secure it with a small rubber band, or even attach a little 1/4" tube to the end if you prefer, and then bend that back with a small rubber band to release it. I'd suggest putting it with a heat pack into a small sock or wrap it up with a piece of light cloth and carry it in your briefs.
I don't really recommend using "someone else's pee" to substitute with, instead of the synthetic concentrates because of the potential problems such as needing someone who is clean and willing that you can ask & needing to be very careful about proper storage and re-heating of real urine to avoid spoilage. But taking those factors into account, it works quite well for many people. Gender is not a factor, as they are not permitted to test it for that, nor anything else outside the range of drugs they're normally looking for, but certain medications taken by the actual "clean pee" donors have been known to trigger a false positive.
Real urine is only good for about 4 hours or so at room or body temp before it starts to spoil and smell quite foul. But you can store it for up to 1 year if it is frozen or 30 days maximum if it is refrigerated. When you warm it up to the proper temp of 94-100f... be sure NOT to use a microwave, as that can easily get it way too hot... and preferably let it thaw out in the refrigerator overnight first. The best way to warm up a frozen/refrigerated sample is with hot water. Place the sample in its zip-lock bag, condom or glue bottle in a bowl and cover it with hot water. Depending on how hot your water is, you can get a sample from frozen to over 100 degrees in about 5 minutes. Of course that's too hot, but it's easier to cool it off while driving to the test than it is to make it warmer.
But if you're feeling lucky and want to take your chances on dilution instead... remember that THC metabolites can be detected for up to 4 to 6 weeks after marijuana use. If you have more than a couple weeks notice, increasing your metabolism is probably the most effective way to decrease the time period that drugs can be detected in your system. The best ways to do that are to get lots of exercise, and eat lots of high-calorie foods... in that order. While exercising will clean THC metabolites from the system at a faster rate, lowering the detection period, it is important to stop burning those fat cells near test time, because the exercise actually increases the amount of THC metabolites in the urine, so you must quit exercising about a week before the test... then be lazy, and eat big and pack on some fresh, clean fat cells on top of the remaining older ones.
You should begin raising your creatinine levels, starting 2 or 3 days before the test. Creatine, which metabolizes into creatinine in 24 to 48 hours, can be raised with red meat and/or Creatine supplement, available online or at nutritional food stores such as GNC. However, any creatine taken within 24 hours of the test is useless as it will not have sufficient time to metabolize properly.
About 2 to 3 hours before the test, start drinking an 8 ounce glass of water quickly every 15 minutes, so that's about 1 quart or liter each hour. Instead of water you can substitute Gatorade, cranberry, grape or any fruit juice, coffee, iced tea, herbal tea, or soft drinks as they are all good diuretics. Diuretics make people urinate frequently. Diuretics without caffeine or alcohol are recommended because caffeine and alcohol have negative side effects. The best choice is Gatorade because of its electrolytes and high sodium content. After about an hour or so, you should be voiding clear urine about every 15 to 20 minutes. Be sure you have voided dilute urine at least 4 or 5 times before your test. Continue drinking 8 more ounces of water or Gatorade every 15 minutes to replace what you've urinated for a total of about 2-3 quarts in 2-3 hours. If you drink too much water, such as a gallon or more, your sample will be more likely to be rejected as being too diluted. Also drinking excessive amounts of water in the days, or even the night before the test doesn't really help.
At about 3 hours before the test, unless you are aspirin-sensitive, take 4 regular aspirin (not Advil or Tylenol) and also take 4 Rolaids or Tums antacid tablets. Then take 4 more aspirin and 4 more Rolaids again at about 2 hours before the test. Instead of causing a false positive, like ibuprofen/advil is known to do, aspirin actually acts a smoke screen interfering with the EMIT assay, and reduces positive readings for 2 to 12 hours.
At about 1 hour before the test, take a vitamin B2 or B-Complex, with 50 or 100mg of B2. However, if the vitamin is time released, you can either take it earlier with the first 2 glasses of water at about 3 hours before the test, or else you'll need to crush it before taking. Within 30 to 45 minutes of taking your B vitamin, your urine should turn from clear to yellow for the next few voids.
There are also many popular home remedies such as fruit pectin (Certo/Sure Gel), goldenseal, niacin and cranberry juice which have been shown to work on many occasions, especially when taken with a couple quarts of water (for dilution) and some vitamin B (for coloring), but they do NOT always work for everyone. Plenty of marijuana smokers have also failed their tests using those remedies, which shows that other factors were involved, such as the amount of water consumed, how much THC was consumed and how long ago, or different metabolism rates. Independent lab tests have concluded that niacin doesn't work at all. In other words, something else probably caused a negative, not the niacin. Also some labs test directly for goldenseal.
Likewise, using adulterants, or direct additives to the urine sample itself, such as bleach, ammonia, and Drano or even those expensive 200% money-back guaranteed "detox" additives is risky, not only because they don't always work, but they are also easy to detect since they usually foul up the PH. While they might pass an EMIT dipstick test, they are often either tested for directly, or can be easily detected on a GC/MS test, in which case you'll have to answer for the obvious tampering.