Yeah my home’s insulated as well. But the water pipes that supply my home are mostly outside. I turn on the tap and get a pint of ice cold water. I’m not sure why a bottle would make it more convenient. I did this when I lived much further south as well. A pint of tap water is actually pretty good. And if you live in a developing country without safe and tasty tap water then your water comes pre chilled from the shop anyway. And it’s easier to just drink it from the bottle it comes in.