Oops correction, vinegar instead of water!

You might look into making a “shrub”. It is fruit, water, and honey. No refrigeration required.

I think it would be ok unrefrigerated short term, but long term it will last longer refrigerated. It does not have any preservatives so if it starts to “turn” bad discontinue using it.

The water and the sugar being boiled it what creates the syrup, if not it’s just juice with water added. You can try adding less it just won’t thicken like a syrup, but you can still use it in drinks and such.