Is there a term in english for where you want to describe the discreet or cautious approach you take, when you want to make sure you're not risking or jeopardizing anything in doing a routine job?

How would a native complete these sentences? :

The ...... is to take two more spare tyres with you when you go off-road.

OR

You have to bring a sleeping bag, in case it gets cold in the forest over night; That is called ...... my friend:)