https://www.amazon.com/HotHands-10-c...s+hand+warmers
These things work like a champ for keeping your hands warm. I used them all the time when I was sitting in a pre-dawn goose blind when It was -20 or colder. They also make them for inside your boots. I know Walmart sells them, as well as a lot of sporting goods stores. As far as feet, you can't go wrong with artic Mucks, they work great even in the coldest weather.
https://www.amazon.com/Muck-Boots-Ar...ks+artic&psc=1
Stay warm, yell loud!