An improved drinking container for soft drinks, flavored drinks as well as other similar nutritional and energy supplement drink products which allow the end user to control the amount of flavor, mix, nutritional or energy supplement or any other additive added to the liquid drink product. The drinking container and method associated therewith permits an end user of the drinking container to controllably inject an additive into the liquid drink product to attain a desired ratio of additive in the drink product via a dispenser having measurement units marked or formed thereon to provide controlled amounts of the additive to the main liquid drink product such as water or carbonated water for flavoring, calorie control and/or nutritional supplements.