back in college, we never used camera bags with lables on them like 'canon' etc... my teachers used to always recommend us to carry our gear in those soft cooler bags and place a few freeze packs in zip locks in them... this way, it wouldn't grab anyone's attention that you had expensive camera gear... this would keep the film nice and cold and the colors would come out amazing... at the same time the camera would get cold enough that it wouldn't fog up in different temperatures
give it a shot... should work
if you dont have time to go pick up the oils and watnot, do what divers do and put some spit on the lense
