Theron,
I've made both Birch Beer NA and with alcohol. It tastes very good. I used Black Birch sap and boiled it to a desired color. Then it is poured over a bunch of the small branch tips that are cut into small pieces. Let it steep until cool. Filter it and add additional sweetening if needed. Carbonation was the problem. I used yeast and had problems. Soda Stream is now available. It carbonates beverages. I haven't used one but I think that would be the way to go.
136 on high vacuum for 2019
A&A 2X8, raised flue evaporator
hood, parallel flow pre heater and air over fire
12X28 sugar shack