OK go to your local grocery store and ask for this
4 hours before your test empty one pacjet into something like a sunny delight or Hawaiin Puch, etc. drink whole packet with drink. Over next two hours drink 4 20 OZ. of water and piss as ,uch as you can. After two hours take other packet and repeat. Piss two more time in last two hours and drink 3 more 20 Oz. of water.