-cordless tool(s) to make work corded, complete with charger. I used these
-an old ac power cord that you don't mind ruining
-an extension cord to run between charger and tool
-foam or something else that's nonconductive, flexible, and easy to work with. i used a dried-out piece of the nastiness that is known as great stuff
-your favorite roll of duct tape
-aluminum foil or other conductive, flexible material
And, it'd make life easier to have:
-something to make the corded adaptor easy to remove from the tool. I used these
, and they worked well.
-pocket knife, leatherman, or other way of cutting and turning screws
-a pack of spare batteries, like these
I'm sure you can do this with other tools; I happened to have a set of the cheap-but-usable Ryobi stuff, so that's what I went with.