With mine it always boils down to
* feed half a can per cat twice a day
* $pickyCat prefers this stack of cans
* feed $lessPickyCat separate so he can't steal the other one's food
Unlike plants, cats don't randomly die because you fed them an hour late or because they had to skip a meal two days ago.
Dog people say cats are evil but some plants just seem to be intent on killing themselves.
- Refill all four water containers - Give them large, heavy dishes full of water because Cat A likes to Knock Shit Over to see if there's water in there. (My hardwood floor has a damaged section because of this: OK if cleaned up fast, not OK if left over the weekend in hot weather.) - Mix in treats so that cat A eats all of her food - Cats B and C like to eat Cat A's food, so feed her in a separate room, then open the door 5 minutes later.
I believe the friend is eager to learn and loves plants himself, but but maybe finding a friend who doesn't kill their own plants would be a good start...