Frustrating weekends

Today is friday, my children go to their dad's this weekend, and even though I have told about countless websites to go to, to learn about their diet and I have told countless times what they can and cannot have, he is still buying just all the wrong stuff for them to eat. He waits until today to let me know that he does not have any food this weekend for them and that he is out of money. I am also out of money, but I know how to cook. So I am spending this day cooking, baking and packing enough food and snacks for two kids for two nights and two days. I am also washing all their clothes, ( he isn't allowed to wash their clothes because he refuses to buy the right detergent) and packing them up for this weekend. Once their the kids will have no structure, will stay up till midnight or later and wake up early, get thier medicine and vitamins at all the wrong time and come home sunday night tired, cranky and hungry. But they seem to love to see their dad so they keep going.I am hoping someday they will realize which one of us tries harder for them.