Another drug test question...

Gunna get random drug test at my job and was thinking about quick fix synthetic urine. I get the stick type test where they make me go to the bathroom alone and piss in a plastic drinking cup (cheap bastards) and then they use a stick to see if im positive or not. This is done at a clinic. Ive watched them do my last one and they didnt even check for temperature i think. Anyway i hear the stick test is the easiest to fool and how safe do you guys think i will be using the quick fix. ALso i work outside and its usually 90 degrees anyway so i dont even have to use a microwave, just always keep a bottle in my pocket. Seems safe to me but just want some reassurance or any flaws in my plan here. Let me know what u think please.