Another tip: if you find yourself cycling in some place in Africa, Indonesia etc. temporarily without access to good lubricants for your bike components, be it chain or bearings, you can use coconut oil. It will work fine for all the components that need lubing (usually it's the chain to cause these emergencies) and it's impervious to peroxidation. (in fact, coconut oil, virgin or refined, has the lowest peroxidation index of all organic non-mineral oils). In other words, it won't get rancid for a very long time.
It's less than ideal in very cold climates, but in the above example that's not a problem.