It depends on how long you have to wait for your drug test. This is how I do it. Put the Urine in a small container with a lid. Heat up some water to about 130F and put it in a bowl. Put the container of urine in the hot water. Have a thermometer handy and test the urine every few minutes until you get the right temp. Its a good idea to heat the urine over 100F so it will be the right temp when you get to the testing center. Keep the container close to your body to keep it warm.