The article gives "sample kits" used by several professional travelers, with some comments on what you need and what's good for which purpose.
Security using WiFi is a real problem. The two approaches are to not have anything "personal" on the machine that hooks up, or to subscribe to a "Virtual LAN relay" service, that encrypts everything on the WiFi link but lets you access your regular computer/network at home for anything sensitive through the service's server.
Physical security of the computer also needs some consideration. Laptops are about the only thing more theft-prone than a good guitar.