After my first chemo 3 weeks ago everything tasted horrible even water or juice, to the point of avoiding eating and drinking. Someone I was chatting to suggested fizzy flavoured water which actually seems to be working! The one I'm using is Tesco's lemon&lime flavoured sparkling spring water nice and cold from the fridge, it's low in added sugar and is actually quite pleasant and refreshing, even food tastes palatable. Probably not everyone's cup of tea but it might work for someone experiencing that chemo mouth!