Drums do not require batteries (edit: unless there's some wireless drumset I don't know about...) As for the guitar, really I think any AA battery will work just fine.
Also, depending on how much you're going to be playing the drums, you might want to look into getting some silencers for the pads and reinforcing the notoriously fragile foot pedals.
Also, depending on how much you're going to be playing the drums, you might want to look into getting some silencers for the pads and reinforcing the notoriously fragile foot pedals.