What is the simplest DNS for the home.

I'm simply looking at adding DNS entries. I don't care about blocking ads, having a dashboard or anything. In fact, if it is just a config file that I define some things in, that would be great.

Considering that routers only allow 2 DNS IPs at a time, it would be nice if it had some caching in case the Internet based one has issues.

Right now I can only find heavier tools like pihole, technicium, and adguard home