1. Don't expect everything to go perfectly. Trust me. It won't and that is Okay. Someone will cry or get sick, or throw a beloved stuffed animal out the window. You will miss an exit, spill your drink or have a flat. That is life. Teach your kids to handle what life throws at them but modelling it yourself. It all starts with expectations.
2. Don't leave home with out ... wet wipes, paper towels & extra trash bags. What goes in... comes out. At the worst possible times and often in large quantities.