[anonymously]

Smaller bags, empty plastic coffee containers, in the freezer or fridg if you have room.
Divide the dry dog food up, use a 1 week supply at a time.

Yes, fish oil can go bad, keep in a cool dry place, but do not freeze. I just use a fish oil capsule per day for each dog, I nip the capsule with scissors and add it to the meal. I take the same stuff myself.

I don’t go near coconut oil, too fatty (imo). You might find some helpful information here: http://skeptvet.com/Blog/2015/04/coconut-oil-for-pets/