I put dry food down at night, and because Tiff is very greedy, and all the time she lived next door in a porch she had her food only at night, I measure out one and a half cat's daily ration, so that she won't get more than a day's ration, as the other two do eat some of it - anything left in the morning I chuck away
then I slip Trigger and Tosker extra during the day if they ask
I don't know how else to arrange it - Trigger is a thin cat, and Tiffany is a fat cat, and Tosker is a timid cat, and I find juggling their different needs rather difficult