Actually mold needs moisture to grow. Oil and fats in general do nothing for it. They can become rancid, which is quite unpleasant, but it is an oxidation reaction easy to delay with air tight containers like simple plastic bags.

Nancy, how do you like cheese? Keeps well, especially if a bit salty and cooks well without water too. Yogurt-like stuff travel well too: that's pretty much why they were invented by Attila's footmen... just kidding.