This article explains how to connect a Chromecast without a normal Wi-Fi setup. Normally, a Chromecast connects directly to the internet via a Wi-Fi connection. If you don't have an internet connection, you can set up a local Wi-Fi network that will still allow you to use your Chromecast without web access.
Chromecast via Hotspot (no Wi-Fi router – one phone) – Updated method!
Make sure to update your Chromecast to the latest firmware. While Chromecast can work without an internet connection, the firmware must be up to date.
On your primary device, open a Google Cast-enabled app and click the “Cast” button.
The primary device will begin searching for compatible devices nearby. Find the screen you want to cast to and select it.
