Don't feed if you're going to brumate. If he or she wants to brumate, it'll likely keep rejecting food. Keeping the snake in a cool area would work, I believe. With mine, if they reject food, I just leave the heat lamps off with the temperature around 55 if I can help it. I do it for about 2-3 weeks. Normal brumation lasts longer, mine is just a little cool down to get them eating.