It is awful losing your taste but it is temporary, mine took a few months to return and probably 6 months untill taste fully recovered. Just bought the supermarket own brand water 6 X 2litre pack. If you get a disgusting taste in your mouth, buy a very small spray bottle from the chemist, buy some Organic Food Grade Sweet Orange Oil 50ml or Lemon. (Used in baking cakes) Fill bottle with water and add one or two drops of the oil. shake it and spray inside your mouth, it will freshen it and the smell is nice. Something like https://www.healthysupplies.co.uk/orange-oil-food-grade-10ml.html but Ive seen it in the supermarket for much cheaper. Just make sure it is food grade and pure and not mixed with other oils like sunflower. I hope this helps in some small part to get you through your chemo.

Ed