The beer you bought from the bar can NOT be used in country map.
Here's how you produce beer in country map:
1. Research "brewery" in your lab
2. Upgrade the farm near Adlyen twice (first potato, then grain)
3. Make sure you have bought Bitterroot farm, then upgrade it twice (first grape, then hops)
4. Build the malthouse near Bitterroot farm and upgrade it to brewery.
Congrats, you're now slowly producing beer. Just wait a few turns until you have enough to trade.