The vial of dehydrated synthetic urine is enough for a standard urine test. The contents of the vial will reconstitute with 90 cc. of water, the volume required for one test according to standard guidelines. When reconstituting the urine, approximately 90 cc. of tap water is recommended. Actual measurement of the water is not essential because of the normal variation in urine concentration. This is synthetic urine and tests within the normal range for human urine when used as directed. You cannot contract any infectious diseases from this product and it does not test positive for any illegal drugs, metabolites or alcohol. DO NOT open the vial until ready for use. This dehydrated urine will absorb moisture from the air causing the contents to clump and slow the dissolving process when it is. This does not adversely affect the test results. This product is stable for one year in the dry form. This urine has been extensively tested by several laboratories using Ames Multistix, EMIT and gas chromatography methods and full spectrum urinalysis methods.