The condom trick might be a bad idea. A small travel shampoo bottle will work alot better and you won't have to worry about it bursting. You will definitely need the hand warmer and a thermometer to check your temperature before you put it in the cup. The donor urine will stay good for up to 8 hours before it starts to break down and go bad. I'm with Killerweed, I wouldn't worry about diluting if your taking in a clean sample and you won't be watched if its for pre-employment. Read the Substitution sticky at the top of forum for all the info on subbing.