@mertgraves some tonic waters contain high fructose corn syrup because of its bitterness. I am not impressed with the diet flavor either. Some manufacturers use saccharin. Have you tried magnesium for the muscle cramps at night? Many years ago I was getting leg cramps. It was very painful so I tried taking a supplement containing calcium as well. A few weeks later no more legs cramps again. I don’t know definitely if the supplement was the cause. I read that the FDA approved quinine for a malaria treatment and NOT leg cramps. You might want to give something else a try.