I am all ready to make my marmalade, got my Sevilles all ready, but I haven't got any blinking muslin to tie up the pips & pith! Any way of getting around this or do I need to go and buy some muslin? (goodness knows where from). Also I'm supposed to use a whole lemon for the amount of oranges I have but I've only got half a lemon left - do you think I really need a whole one?