Toilet water supply line recommendations?

[Gilbert]

You will want to drain the tank in addition to turning off the water before changing the supply lines. The residual water in the tank can be taken up with a small towel or rag and squeezed into the bowl, sink or bucket. It’s always good to keep a towel under the lines as you disconnect them. The ones I have replaced have flared ends which don’t need teflon tape.

If you are able, it is a good time to replace the shutoff valves to quarter turn ball valves if you have stem valves. When we replaced our toilets a few years ago, I ended up replacing the shutoff valves and the supply lines.