We (by 'we' I obviously mean DH ) would forget our heads if they weren't attached so I want to have a bag that lives in the car and can get us out of a tight corner. I don't want it to be huge so the contents have to be minimal but useful.
In fact it would be good if it was small enough to be hidden under a seat so that DH doesn't know it's there until it's needed, otherwise he won't bother bringing anything with him and I'll have to keep topping it up again.
So far I'm going to include
nappy/wipes/nappy bag
basic change of clothes for each child
bottle of water and straws (or should I have a sippy cup for DD?)
a couple of plastic bags for DS to throw up into/store soiled clothes
pack of oatcakes and snack-sized raisins
small bottle of antiseptic hand gel
kitchen roll (not a full one)
Optional extras are
one or two muslins
sunblock (I may be being overly optimistic here)
We already have a first aid kit in the car so this would just be child-related.