They could just switch their dns back to auto (or statically use google/cloudflare/etc depending on how you configure it), no? Then fix it when you’re back.
You could also set up 2 ssids depending on your WiFi set up. Point one to pi hole and the other to a different DNS provider. Instruction if pi hole breaks is just switch WiFi.
You could also set up 2 ssids depending on your WiFi set up. Point one to pi hole and the other to a different DNS provider. Instruction if pi hole breaks is just switch WiFi.