What to use instead of white wine in recipes?
A lot of the time, the major purpose of the wine is acidity. You can get this with lemon juice, tomato, or vinegar instead. Since the flavor is different, you will need to experiment by tasting, and probably use different amounts, but you should still be able to get good results. In the fondue recipe you mention, you would probably do well with a combination of lemon juice and red wine vinegar.