Do you have to have Internet to have WiFi?

You buy a wireless router and power it up. By default, most home wireless routers are manufactured with WiFi enabled.

The WiFi network name (SSID) and pass phrase should either be on the router’s label or in the user guide.

There should also be a password that will allow you to log on to the router’s settings and change them, including changing the WiFi name and encryption details. Changing WiFi settings is best done from a PC connected by Ethernet. If you change WiFi settings over a WiFi connection and make a mistake, you may not be able to use the WiFi until the error is corrected.

The ports on the router that normally provide the connection to the Internet are left unused.

Wi-Fi is just a wireless network connection, Internet is not required to set up a Wi-Fi LAN, so yes, you can get Wi-Fi without Internet

The only device you need is a Wireless Access Point (WAP)

First, you need to set up the WAP with an SSID (network name) and maybe security (Like WPA), WAPs come with a preset SSID, so if you’re fine with the name it comes with, you can probably skip that step

From there, you just need to connect to it, go into your network settings and set a static IP

So for device one, you would type something like this

IP: 192.168.1.1

Netmask: 255.255.255.0

For device 2, you would type something like this

IP: 192.168.1.2

Netmask: 255.255.255.0