Maybe just suggest he buy whatever disposable things he wants then. And that he can throw them out to his hearts content. And then tell him not to throw your stuff out since you can't afford to keep buying disposable things.
We've been trying to avoid having different stuff for everyone in the house when it comes to things like cleaning supplies, because of space/expense.
It's not really a big deal, just one of those little annoyances, you know? Sorta like the time he said he'd replace the maple syrup that had run out and comes back with a bottle of "syrup with maple flavoring."
Hail to the Lord of Death and Destruction! CATNIP FOR THE CAT GOD! YARN FOR THE YARN THRONE! MILK FOR THE MILK BOWL!