

Don’t forget about Tobler’s first law of geography.
Everything is related to everything else, but near things are more related than distant things
Cultural patterns will generally follow migration of people, which will largely be localized, but of course there are exceptions in which case you can get some interesting blends.

Another thing to check, do you pre-warm the bottle? If not, it will absorb the heat of (ie, cool down) the coffee as soon as you pour it in. But if you get scalding hot water from your faucet or a kettle, pour it in, wait a minute, and dump it you will have a warm bottle that won’t feel the need to take as much heat from the coffee.