Yes, you can re-carbonate a drink that has gone flat, according to the following guidelines.
Please keep in mind that results may vary, and some drinks might not taste the same as when they were initially carbonated.
- The bottle is filled to the fill line > Re-carbonate
- The bottle is not filled to the fill line > (1) Pour the drink into a smaller bottle (0.5L/ 430 ml) and fill it to the fill line > (2) Re-carbonate.
It's not recommended to re-carbonate partially filled bottles (not reaching the fill line), as the carbonation process will be less efficient, requiring more CO2, and the results may not be as satisfactory.