We recommend getting a mobile hotspot (such as, Verizon JetPack, MiFi, et cetera). Mobile hotspots allow you to get Web access AND they act as a router, so your PC will have Web access and a generated wireless network on which to connect to the tablet running Kiosk.
We also recommend checking out a program called Connectify. It’s free (for non-commercial use), and makes your Helper computer into its own router. This way, you can connect your PC to a nearby WiFi network then re-broadcast it securely over the PC-generated network created by Connectify.