Hi, Having had below average results from a couple of 6 bottle wine kits I would like to try and improve things with adding extra grape juice. My question is - at which stage would I add this?
I have always found the kits i have made drinkable (i only made the cheaper end ones in the early days) so i couldn't advise you on how much or what to add.
You can add grape juice concentrate or grape juice enricher. The concentrated grape juice will have a higher level of sugar, than the enricher, which is a more natural product.
Add it at the start with the rest of the ingredients.
Instead of adding grape juice you could always make it short to try and improve the taste. Alternatively maybe use a litre of apple juice to add some additional complexity to the wine. I do use grape juice enricher but generally only with wines made with fruit.