I was skinny my whole life, but I've managed to get to 200 lbs while being 6'3. I still want to put on more muscle and I find the time to lift 4 times a week, but eating a calorie surplus everyday is very hard. When I have a busy day I find it extremely difficult to sit down and eat enough (healthy) food to make gains, especially when I'm not at home.

What food do you recommend to eat when you're not home? Meal prepping something like rice and chicken doesn't really work for me when there is no microwave around to heat it up a bit.