Dietitian and mother-of-two Margaret Hays reckons the best nutrition tip for leavers is simple - remember to eat.
Ms Hays, of the Dietitians Association of Australia, said it might be unrealistic to expect leavers to be cooking up a storm at their Rottnest cabin or Dunsborough caravan.
But the most important tip was to try to eat substantial meals regularly and drink plenty of non-alcoholic drinks.
"My best tip is to eat regularly. Kids are probably used to having structured meal times at home, but if they go over there and say 'I'm not hungry, I'm not hungry' and start drinking at two in the afternoon, well that's gone pear-shaped fast," she said.
"It could get very ugly."
Mr Hays said pasta and rice were good options for easy-to-cook meals.
"Another option is families might want to cook up a big spaghetti Bolognese, or a big lasagne and send it over there. Then the kids can just add salads," she said.
"At Rottnest, the barbecues are good, so they could cook up meat and serve with salad."
Realistically, fast food was likely to be a major source of meals but it didn't have to be a nutritional nightmare, she said.
"Wraps are usually a better option because they have salad and some lean protein in there," she said.
"Kebabs are a good option.
"If you're going to get fish and chips get grilled fish, a small serve of chips and a salad."
But Ms Hays said it was important kids realised that eating well could help mitigate the harm caused by drinking too much.
"If you have food on board, it slows down absorption of alcohol and preserves your stomach from
being irritated from the alcohol," she said.
"We really don't want kids binge drinking.
"A lot of these kids aren't really used to drinking that much alcohol really.
"But if they are eating, they are going to be able to tolerate their alcohol a whole lot better."