As in every former British Colony, tea , chai in Swahili, is essential. It is widely cultured in the Highlands and great amounts are exported. It is usually served with milk and sugar. Kenyan coffee is very good and one of the main export products. It is usually served with milk.
Beer is the national drink.
Ask for a cold beer if you want cold beer. You will probably drink Tusker , in a half liter bottle. I do like it. Wines served in restaurants are mainly South African, European or North American. In the Lake Naivasha region there are vineyards which are used to elaborate the Naivasha White, a good wine, and the Naivasha Red, not at all.