I use Starbrite, and it’s what I recommend on this site. https://www.amazon.com/AMRS-31400R-6-Starbrite-Non-Toxic-Anti-Freeze-Restrictions/dp/B00NKV0QM8
I’ve also used Splash RV Antifreeze from Menards, which worked fine.
So, really, any major brand should do the trick. The most important thing is to get an antifreeze specifically made for RV plumbing use.