Twenty-seven pizzas with a drop of marmalade as reserve.
Always good to have a reserve tank. A spare roll of toilet paper, a bar of chocolate or some long-life milk. They all add a feeling of safety.
You do need to remember where you put these valuable resources, when the pilot forgot to switch to the second fuel tank as we were about to land in a small four seat airplane, we almost “ran out of time”.
So keep it in a good place and then, that extra bottle of white wine vinegar will always be available to sour a piece of cabbage or complete a salad dressing.