Root beer can have somewhat different tastes, depending on the roots (licorice, sasparilla, etc) and how it's brewed. The commercial stuff is completely non-alcoholic, but there are homemade versions that have a little. Possibly microbrew as well as homebrew, these days. By US law, "non-alcoholic beer" means beer that contains less than 0.5% alcohol. You can ferment root beer enough to get 0.5% alcohol.

Moxie is like that because of gentian violet. I don't know if it's possible to drink enough to cure thrush.