When making wine, grape juice that contains 7–23% of pulp, skins, stems and seeds is referred to as "must". Drink or dispose of the 5 litres of water. Grape juice can also be pasteurised, which will remove any naturally occurring yeast, the resulting liquid will not ferment if kept sterile, and therefore contains no alcohol. Choose from our variety of fresh California Wine Grapes and 100% Regina Grape Juice (NOT from concentrate). Most people prefer to do this over a few days. If you have placed your grape juice in the fridge, make sure to take it out and let it get back to room temperature before continuing with the wine-making process. Your grape juice should be kept at room temperature, not in the fridge. Our team will be happy to … Wine Grapes & Juice.