It is possible to use dried yeast powder instead but it should be rehydrated first to proof it (make sure it’s still alive). To do this place a packet of yeast into a glass jug and add a cup of warm, boiled water (35-40 degrees C). Cover with clingfilm and leave for 15 minutes. Add a teaspoonful of sugar, re cover and place in a warm area out of sunlight. After 30 minutes there should be a foamy head and is ready to be added to your wine.