I totally understand about the fluoridated water.
Bodhi is currently on antibiotics, and we find that giving her the abx *after* a meal helps her keep her appetite. Giving them before a meal seems to make her nauseous... and she definitely doesn't want to eat or drink anything after the abx. But after a meal, it doesn't seem to make her queasy.
She doesn't like the abx ground into her meal (she'll refuse the meal). We grind the pill and then mix it with a bit of butter, and give it after she's had a meal and a drink.
Are you giving the abx before, during or after a meal?