Olive oil (extra virgin) is part of my kit. Most of the time it just provides calories and added taste to my diet. But there are many other uses for it.
Ear ache. Warm some and pour it in the ear canal*
Good for constipation. Just add extra to your food.
Good for shaving
Good for scratches/chafing and burns (after copious cold water has been pored on it and obviously if other burn treatments are not at hand)
Great for bees stings, just rub in as soon as possible.
(BTW, bacteria cannot grow on olive oil)
A drop on toilet paper or better still cotton, will make a good fire starter.
And as a lubricant.
* If you need a "Make sure it isn't too hot or you will burn yourself " warning, well maybe you should not go around unsupervised