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The cheap comes out expensive.
I vote for a thermos, that way your hot stuff stays hot and your cold stays cold. BTW make sure you pre rinse it with either hot or cold before you add your liquid of same temp type you pre rinsed with. (hot for hot, cold for cold) That way it warms or cools the barrier in advance. Typically I will fill my thermos with hot water and let it sit while I make my tea then dump it right when I am ready to fill. This gives me extra hot time, upwards of 8 hours.
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