After 4 more days, I couldn’t resist any longer, so I opened the bottle. I know I should have left it a couple of days longer, but it was good – effervescent, instead of fizzy, but it definitely had the right taste.
I have another jar ready for bottling, which will do another 1 litre bottle, plus a bit left over.
At the moment, I am brewing in a glass cookie jar, with muslin over the top. I think I will buy a couple of gallon demijohns, with wine-making airlocks, and see how things go with that.