I'm preparing to leave on Christmas Eve for the 277 mile bicycle tour over five days. I have some questions

Almost all places will be closed on Christmas Day. I'll have food but will need to refill water. Worst case scenario I would knock on someone's door and ask to fill up. Anyone ever do this before?

I am considering carrying an empty milk jug for water on the first couple of nights and will try to fill up a few miles away from where I will camp. My question is how to carry the water jug on my bike.

Wool socks.... I find a lot of them are 65% wool. Best to go that route or 100% wool?

I did get a new winter sleeping bag. Though my air stress is rated 2.9 and I am hoping that will work. A friend mentioned lining the mattress with an emergency blanket to add some extra heat. Thoughts on this?