Hi, in the past I have always used a spoon full of sugar in a bottle before capping it. My latest kit suggested half a tea spoon of malt extract instead of sugar. I have just tried a bottle after 6 days and it is flat. I think it is probably because the bottles have been stored in a cold place and the malt extract has not fermented. Can I just leave them for several weeks and wait for the temperature to rise or do I need to get the fermentation going now. Hope that makes sense.