drug test question- need opinions

Ok my employer does random drug testing, but it's not a very in-depth process. they test our samples right in front of us with their test strips. the sweet thing is that they dont watch us pee. my question is do you guys think i could get away with just putting some warm water from the sink into my cup and adding a few drops of yellow food coloring? what you think? i happen to think its a better idea than submitting my own urine and most likely failing.....

Its possible I'd buy some cheap test strips and experiment

i dont think experimenting with test strips would do anything....i already know if i stick a test strip into a cup of warm water and food coloring it will be negative. i guess i should buy some yellow coloring though and see if i can make some authentic looking urine.