laptop < bare-bones OS[3] < neighbors wifi[1] < (pfSense VM[0] + VPN) < (pfSense VM + multiple per-connection load-balanced anon VPNs + pfBlocker NG) < (Tails | Whonix Gateway) < (Whonix Workstation Live mode | Windows IE VM[2])

[0] With DNS trimming, forced DoH(TTPS), forced over VPN, no VPN no internet

[1] While inter-railing, tickets paid in cash

[2] https://www.amiunique.org/

[3] installed on an SD card or USB-C attached NVMe, with a dummy OS install on the built-in storage

And even then, the best anonymity is to just pretend to be somebody else, proxy through their home internet with stolen cookies and same browser version, using the same laptop model as them. Many 2nd-hand laptop and phone shops forget to wipe the previous owners data, or will 'forget' for a few extra dollars.