Pi-Hole and PiVPN [0] is a great setup for DNS filtering on-the-go. The setup for PiVPN makes it foolproof as well.

When my Pi stopped working and I couldn’t find a new one, I gave up and moved to NextDNS [1] and have been very happy.

[0] https://www.pivpn.io/ [1] https://nextdns.io/