Making your own drink powders?
From Asian supply shops you can often find small packets of powdered fruits. Check the packet but many are made from actual fruit!

I have seen Apple, Cherry, Coconut, Lime, Mango, Pomegranate, Strawberry etc.

Google for powdered fruit and you'll find a variety of online sources

My favourite is Lime powder (99% Lime, made in Malaysia)

Add Aloe Vera powder to make a thickened drink

Add Arrowroot or instant custard powder to make a cloudy "juice"

Add Ascorbic acid powder (Vit. C) as a preservative (be careful not to exceed RDI)

Add Citric acid to make it more citrus like

Add sugar (real or fake) to bulk it out so a simple measure (e.g. one tea spoon) makes a glass of drink

Experiment with the quantities, but you don't need much of anything to get an effective result