What fruits and veggies can I use to make teething ice cubes?

My darling is 6.5 months and she has her bottom teeth but now her top ones are coming through and she’s in pain poor poppet.

I want to maker her some teething cubes – I was wanting to use healthy veggies such as kale and or beet-root – watered down but not sure if I can use these kinds of veggies and can’t find anything on line, I’ve given her apple and pear – so I’m assuming these are ok to use.

Do I need to water them down so the sugar is not so concentrated?

Love your thoughts and experience.
Thanks!