back in the days when we had cats (before a daughter with asthma triggered by them), we used to keep emergency reserves in the form of tins of tuna.
Could then be deployed for cats or humans as needed
Bizarrely of my current four cats, two are very averse to eating tuna or anything tuna flavoured. One will only eat dry food, apparently this was her only experience before coming to live with me and she regards the wet stuff eaten by the others with great suspicion, occasionally sniffing round it but then backing off. Most bizarre of all one is simply terrified of shrimps/prawns! The cat before the current lot lived with me for some while on her own as she had got to be elderly and I felt it wasn't fair to inflict any new companions on her. Milly's greatest delight was any cat food with prawns in it or - the most heavenly treat of all - two or three real prawns. As she got older and couldn't do so much, one little thing to make her life interesting was to keep a bag of the tiny economy type prawns in the fridge and defrost a few for her whenever very cold weather or rain was making her feel she didn't want to go out. After Milly died the remainder of the last bag of prawns sat in the freezer for a little while until Miss Whizz came into my life and I thought a prawn or two might help her settle in. Her terror was a complete surprise and to this day she won't eat any cat food which contains even the tiniest shrimps.
The most recent stray to inform me that he was adopting me and wasn't I lucky most fortunately likes both tuna and shrimps and hoovers up anything from selection packs regarded as no go by the other three