It is easy to set up a travel router and Pi-hole for use when you travel. I do this frequently.
Small travel router (in my case a TP-Link) than can either extend an existing WiFi network, or can connect via ethernet. The router is on an IP range completely different than my home network, and has a dedicated Pi Zero W with a real time clock module that is set to connect to that router.
At home, I set this router up with an ethernet connection to my home router. Then I set up all the devices that will travel with me/us on the SSID of the travel router, and tell the devices to remember this network.
When I get where I'm going, I plug in the travel router, connect it to the local network, turn on the Pi, all the devices we travel with find this network automatically, and we're set. Private network with a Pi-hole.
I actually had to use this setup today in my own home when our ISP had an outage due to a storm. Kept me up and running doing work on the internet for three hours until they fixed the outage.
