Bass drum - find the kid who has a drumset at home. Have them take the pillow out of their bass drum and use that. If you don't have anyone with a drumset, I bet somebody has a big barrel of some sort in their garage with some resonance.
Snare drum - I'm sure somebody has one.
Crash cymbal, triangle, tambourine - time to go dig in the kitchen drawers or the toolbox to find something that approximates the sound.
Barring that, just have them say "boooom" and "ting" in the right rhythm.