Somalis adore spiced tea. A minority of Somalis drink a tea similar to Turkish tea which they brought from Middle eastern countries to their homeland. However, the majority drink a traditional and cultural tea known as Shah Hawaash because it is made of cardamom in Somali, Xawaash or Hayle} and cinnamon bark (in Somali, Qoronfil.
Islam forbids alcohol and Somalia follows this rather strictly. If you do find some, don't show it or drink it in public, as there's a strong chance that you could offend, cause a scene and may even be punished by authorities.
As for the coffee kahwa itself, try mirra, made in the Somali style. Sometimes spiced with cardamom, it's strong and tastes great, particularly drunk with fresh dates. Tea chai usually comes with dollops of sugar and perhaps a few mint leaves na'ana.