you should use chapstick (yes, that's the name), it's really cheap, and very handy. if you can't buy it for now, you should use vaseline, which works REALLY well. the only negative point about vaseline is that it only hydrates your lips, and a good chapstick will protect your skin lip from any damage caused by the sun and ALSO hydrates.
If you have olive oil and sugar, try mixing a little of each to make an exfoliant for your lips. The sugar will remove the dead skin and the olive oil will moisturize and protect. Mix them together gently rub on then rinse off with water. Then if you like use a little plain olive oil on them