What is he actually capable of?
I assume he can get himself up, showered, shaved and dressed, and that these absolute basics don't fall to you. If he can't, can he get help in these areas from Social Work carers? Ask your GP for a referral.
Once up and running (figuratively speaking) how does he spend his day?
If he sits in an armchair watching TV while you do everything to keep the home going and keep him fed, watered and entertained, then he willl be getting bored and lethargic, which is a sure-fire recipe for depression. He needs some responsibilities and some work to keep his hands and brain in use - and you need some help with the chores.
Can he peel and chop vegetables? Sit him at a table with some washed potatoes, carrots, onions etc and some bouillon powder (Marigold?), a potato peeler, a knife, a cutting board a big saucepan and a basic soup recipe.
Repeat this with sugar, flour, fat, apples, potato peeler, knife, cutting board, oven-proof dish and recipe for apple crumble. A short tutorial might be needed on rubbing in the fat, or mashing it in with a fork, or he might prefer the high-tech (and therefore more masculine) option of using a food processor.
Hey presto - he has made an excellent meal, and filled in a whole morning or afternoon with Meaningful Activity.