Apostle Malm has laid down the law on what you should do about food on Saturdays. This is how he does it and expects you to do it likewise, because only grievous sinners would DARE to eat out or fix food now that they know the truth!
I have not cooked on Sabbath or Holy Days since the early 80s and with a little thought and adjustment of habits, it works out very well. There is simply no need to cook etc on any High Day if one is properly prepared. We need to break free of our addiction to big food and a party style good time; and make God our passion. Just relaxing and discussing scripture with a loaf of bread, cheese, a salad, piece of fruit etc and something to drink would make for an excellent High day repast. We usually have a grand dinner before Sabbath or High Day making sure of some good leftovers for the next day. Often I enjoy a tea and ban muffin with marmalade for breakfast, a salad, pear and cheese, with bread and even sometimes warmed soup for lunch; and for late afternoon some of those leftovers. Its just that easy.
