if you dont have oil in our sharpening kit ( mine is not extensive .. small oil stone, small bottle of oil , rag .. in a plastic bag )Oil , rag .. wipe it around the blade . Not hard .
If you have a car , you have oil , either spare , or when you pull the dipstick you got enough in a couple drops off it
you may have petroleum jelly in your fire kit if you have pj and cottonballs as emergency fire starter . Wipe a smidge of it on your blade and spread it around .
If you brung salami sandwiches .. you have fat , before you eat it all , clean your knife as you best can and then wipe the salami over the blade so it leaves a greasy trace .
If you have been hunting , you have fat , take the time to render some .. stick it on a rock next to your fire , cook it down in a pan , heat it up somehow to seperate the oils from the meat part , you want the oil part .. yeah it goes solid when it cools ,and feels yuck but it works and wont ( usually anyway ) go rancid if its been rendered .
Usually , unless you're coastal and wet or tropical and wet or both , the blades natural patina is a seriously good preventative . Keeping the blade dry is enough for a fair while . Keeping th eblade dry tho means dry , not like a wipe on back the jeans leg dry as if its a stainless knife like object ... but taking the time to dry it ( maybe wipe it 2 or 3 times instead )