You would think that the answer would be none, but that is not always the case. Most drinks that are labeled "non-alcoholic" can have up to 0.05% ABV (alcohol by volume). If you are making a drink with tonic water or seltzer water, you should be fine, but if you are using non-alcoholic vodka, tequila, wine, or other substitutes, you will want to check to ensure the base has a 0.00% ABV.