How can I make a homemade stay off spray for cats?

Cats HATE cinnamon. I am not sure how you would make a 'spray' but maybe you could just sprinkle a bit of it on? Check to make sure it won't stain if it is cloth/carpet. We sprinkle it on Christmas treeat my son's house to keep cat off. Seems to work great. You might also check fabric sprays like Febreeze to see if they have a cinnamon scent. You can also use cinnamon sticks. Tie into little bundles with a pretty ribbon. I suppose you could mix a bit of cinnamon with water in a spray bottle and see if that works. Good Luck.

They don't like the smell of lemon either.

vinegar is another scent they do not like

I've added cayenne pepper in outdoor flower beds to "convince" cats this isn't their litterbox!

Cats hate citrus - place lemon or orange peels where you want to chase them away.