It's always messy and produces a lot more liquid feeding the worms table scraps so now I am just giving them compost that I make in my compost bin. I add some coffee grounds, a little alfalfa meal, kelp meal and a teaspoon or so of rock dust along with some powdered eggshell I crush and feed that mix to them after wetting it a little. It's much easier to just put the table scraps in the compost bin and it eliminates excess water which is what kills worms the most in bins. Compost is loaded with bacterial exudes which is what the worms "eat" anyhow as they can't eat food until it breaks down.