Diet Coke - The lighter Coke taste. Celebrating all things fashion, fun and fabulous. Diet Coke adds some sparkle to your day. A 2L bottle perfect for parties, family occasions or just sharing the happiness. Diet Coke is a sparkling low calorie cola soft drink with vegetable extracts and sweeteners. Suitable for vegetarians and vegans. Gluten free, dairy free, nut free. Diet Coke - the lighter Coke taste.