Vinegar has lots of uses, salt (saline) solution is great for cleaning wounds and washing out sore eyes (get the concentration right) and also mixed to a paste with vaseline works well on wounds, honey is great for wounds as is sugar, witch hazel solution also good for sore eyes as is cold tea. Epsom salts makes a good poultice with a diaper to draw out infections from puncture wounds - and they used to use dry bread to make poultices years ago
There are lots of good omega oils to be found on supermarket shelves - corn oil is not one of them
In wartime when food for animals was in short supply in the UK horses were fed boiled potatos to put flesh on them - my grandmother said nothing ever suffered as a result of feeding them.