1 Cut up the jelly and dissolve it in 150ml boiling water. 2  Add 200ml cold water and the vodka, to make up 600ml.3  Pour into ice-cube trays and leave in the fridge overnight to set. 135g pack fruit jelly. 2  Cut up the jelly and dissolve it in 150ml boiling water. 3  Add 200ml cold water and the vodka, to make up 600ml. 4  Pour into ice-cube trays and leave in the fridge overnight to set.