In our daily life, car has a function more than a vehicle. Even it can be say, it is your expanded house. When you are in a holiday, Bali for an example, and forced to use rent car, that is when you are really appreciate your own vehicle.
When you going on anywhere by bringing one or more children, one thing you must ready in every vehicle, own car or rent car is tissue. Tissue is the most important thing in every rent vehicle.
And also a bottle of water. Bring water bottle as many as you can. Water is very important for emergency condition such as relieving thirst and clean anything, including your children. Never seduced to bring soda water or fruit taste water, because maybe you won't need to drink it.
First aid kit, matches, tissue, spare shirt for everyone, a towel, raincoat, cleaning tissue, antibacterial soap, and candies or other snacks can be kept in one bag. Remember to not bring the bag outside, so don't worry to fill it. This bag will be left in the car during your trip.
You don't need to put car security tools in this bag, but make sure your trunk is filled with safety equipment which will be needed in emergency time, such as the safety triangle, jack, spare tires, glass cleaner liquid and oil. By preparing things that usually prepared in daily your daily life, your holidays will going just well.