To ask how much water I should use to dilute pure apple juice?

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My 5 year old is on medication that requires her to drink a lot of fluid for it to work. She will only drink apple juice from concentrate. I used to dilute it 1 part juice to 10 parts water as recommended for babies but she is refusing to drink it now saying it tastes like water after I stupidly started putting cartons of apple juice in her packed lunch. I can't seem to find any info on how much juice should be diluted for an older child, does anyone know?

My mum (retired children's dentist) said to treat juice in exactly the same way as squash. (Though ideally you don't give either, but that's beside the point of the OP's question). I agree with a pp's idea of going a taste test but decide what your upper limit is first. Personally I wouldnt go as high as 50/50.

It is fresh apple juice in a carton, not squash.

It is all she drinks though that's why I dilute it

oooh interesting about the fizzy water.