Everyone here is correct, lots of layers and wool. The only exception is cold windy days, it’s damn difficult to prepare for wind. On a -40 windy day there’s not a lot you can do. Hand warmers, or even better heated gloves can be amazing on those days for when you just can’t get your hands warm. My girlfriend uses a heated vest regularly and she loves it. I also almost always have a large thermos of hot soup or tea to sip on on break.

On stupid cold days I’ll sometimes where two wool baselayers. I find the layers rubbing generate heat and that can be lovely.

Yeah, if you are drinking a ton of water and also electrolytes and you’re still peeing constantly you need to see your doctor ASAP

Put a pinch Himalayan salt in your water. If you’re drinking a lot of water but still thirsty and peeing a lot it usually means you’re low on electrolytes.

Firefox can save passwords without an extension although there is a password manager you can add. Sign into something on Firefox and it will ask you to if you want to save your login. I’ve haven’t needed google for any reason after switching.