You need to practice keeping its temperature at 98 degrees (or between 94-98). I practiced with water. Nuke it for 10 seconds, measure the temp, stash it where you are going to, then check it every 15 minutes.

People use all kinds of methods to keep it warm... including using those heating pads that hunters use. This can make it too hot if you aren't careful, so practice accordingly.

If you can pass it off at 94 to 98 degrees, you passed your test.

Good luck.