I had a bunch of apples past their prime, I cored and chopped then froze them. I take a handful or so out at a time and let it defrost before I feed it to the worms.

Great stuff, but way too much to give to a pound of worms all at once. Smash or cut the grapes, too. Tough for the worms to "bite" through the grape skin.

Any chance you have a regular compost bin? A converted trash can would work (see link below). Find a tray to collect any drippings if you're keeping it inside the warehouse. Then you could dump the fruit in this bin and take stuff out when you need it for the squirm. Of course fruit flies may become an issue. There are ways to reduce that problem, but not to really eliminate it.

Andrew

Here is a link that might be useful: garbage can compost bin