An interesting point to note about the Muntons premium, as opposed to the Wilco kits, which are Muntons mondego rebadged) is that they are 41% pure grape juice concentrate, only half of which is the named variety. This means that only half of the finished wine is made from reconstituted grape juice, the rest being from glucose, fructose and water. Once mixed, the sg is 1075, only enough to produce 10% abv. It therefore makes sense to use less (by 2 litres or more) water to improve the body and alcohol level. The addition of oak chips would also improve it. The quality of local tap water is a factor too. Mine is somewhat alkaline (pH 7.8, 7.0 being neutral) and therefore reduces the overall acidity of the wine to below what it should be. Using a jug filter significantly improves the taste of tea and coffee. Boiling the water helps if you happen to have a large (15 litre) water boiler, but I can get that much bottled water for £3.
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