Idea 9: Encourage them to eat less meat beforehand and/or fast
Cutting down on meat and fasting for the last 3 days (http://www.myziyarat.ca/Books/ZIYARAT-IRAQ.pdf (page 7)) before the trip is also highly recommended.
If your children are too young, encouraging them to eat less, and perhaps less of the junky food, may be a good way to emphaises this aspect. It will also stress the importance of how what we eat affects our spiritual state – a good reminder for us parents as well!