Seems like a lot of money and work when you can accomplish the same thing by using Quick Fix synthetic urine. I can purchase it online for 25$, it comes with a hand warmer(8 hours of warmth), a temperature strip, and can be reheated as many times as you want. The only downside to it, is you can't use it when your being observed.

This all being said... How the hell were you tested 12-30 times a year and completely prepared every single time comfortably? Ive never heard of someone tested to this extent. Were you job jumping or on probation? This all sounds a bit far fetched to me.