I'm brewing a sparkling elderflower drink that relies on the natural yeasts present on the flowers/stalks to carbonate the drink after it has been transferred to bottles (swing-top type). There is sufficient sugar in the recipe, and this has worked for me in the past, but I've read that this sometimes doesn't work. Is there a way to carbonate an already-bottled drink that is flat, without affecting alcohol content or flavour?

The ingredients for 4.5 litres is:

  • 7 elderflower heads
  • 750 g sugar
  • 2 lemons
  • 2 table spoons wine vinegar

2 Answers 2


I'll assume this is not a very foamy beverage, and say: carbonate it like homemade soda.

BTW- carbonation makes a drink more tart, so the flavor will change a little.

  • Thanks for the link - I thought there must be something like this on the market.
    – jonpd
    Commented Jun 17, 2015 at 13:04

In short: not with what you want to use. The carbonation (CO2) is formed as a by-product of alcohol forming from the yeast eating the sugar (less sugar and more alcohol = altered flavour)

There is a way of doing it, using compressed CO2. This requires a carbonator and CO2 cartridges. It is worth the investment if you want to use the carbonator a lot, but if it's only to save one batch, I (poor) would consider drinking it flat

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