I would also not add the wine or kirsch until you reheat it, if you are doing a cheese fondue. Reheat on stove or in a double boiler and stir, then put in fondue pot over sterno.
Cheese fondue can be made in advance. If it stiffens, simply heat slowly over medium heat. If it seprates, add a little milk. Chocolate fondue can also be made in advance and reheated.
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