Hmm... a little tricky to choose just one!
Beer for a social drink in a bar, with sport or a barbecue, wine at home or with dinner. Either one when cooking dinner outdoors.
Whiskey in the evenings with friends and conversation.
Port after dessert, brandy with coffee (but served alongside the coffee in the Portuguese style, not mixed into it).
Homemade chili vodka for kicks.
Tequila or rum mixed with fruit juice in the afternoons or just when I feel a need for vitamins.
Bloody Mary or Buck's Fizz at breakfast.