Need Help on Giving My Test a Bath

What is the best way to give my Test a hot bath? Should I boil water, and then put the Test bottle in a zip lock bag? or should i just take hot water from the sink and put it in a ziploc and warm it like that? do i need to warm it up in the original bottle or could i give it a warm bath in the syringe inside a ziploc bag?

i use hot water from a tap....I actually carefully warm up the loaded syringe instead of the whole bottle. But if you are warming it up for drawing up easier, then hot water from a tap is good enough...no need to boil water IMO