The Cantina range of wine kits contains 5 litres of concentrated grape juice which means that no additional sugar is required to make up to 30 bottles of wine. Unlike most of our large wine kits, which are made up to 23ltrs, the Cantina kits are made up to 21ltrs and will not actually give you "30 bottles" unless you only put 70cl in each bottle rather than the 75cl found in a "standard" wine bottle. If you are using "standard" wine bottles, you will only get about 24-26 bottles in practice.
Using a special strain of yeast, these wine kits ferment in around 5 days, clear in 2 days and are, nominally, ready to drink immediately. In practice, as with all commercial wines, it improves immeasurably if left for a few months to mature.