Powdered urine comes in a small tube and must be mixed with tap water in a small pouch (or condom) which is included. Typically the pouch, which holds about 3 ounces, is carried next to the skin so it will become body temperature and fall within the normal 90 to 100 degree range for urine tests. This premixed urine is used to fill the sample cup. Byrd Labs' Drug Free Powdered Urine was developed in 1986 and has worked without fail, continually protecting worker's rights. It has worked perfectly all these years. Powdered urine requires some slight of hand so some people prefer a small additive. Powdered urine is guaranteed drug free and tests normally on adulteration tests. This popular seller has been used for almost 20 years.