Drinking flavors for sparkling water, from Aromhuset, which come in 30 ml PET bottles is a great way to make water taste refreshing without adding any sugar.
These flavors consist of no sugar, no sweeteners and no synthetic aromas and still they taste fantastic. Add them to purchased carbonated water or water carbonated at home. There are many varieties of flavors.
Having different flavors at home will make water so much more enjoyable. With only one 30ml bottle, using the flavor of your choice, you can add taste to 15 liters of water.