There are food grade hoses, and then there are food grade hoses, your cheapy food grade hoses smell just like the plastic cheap garden hoses, your better hoses don't.
The best hose to get is the lay flat style hoses like fire trucks use, canvas sort of thing they are, they make them on a wind up roll for carvans and stuff, but they're not cheap. Bicarb or a bit of vinegar will help with the fowl taste, but once it get into your tanks it's hard to get it out.