As a squash alternative look for cordial like Belvoir or Rocks. Cordial was the precursor to squash until the manufacturers realised they could make a cheaper chemical laden product.
I think Asda does some nice own brand cordial like apple and elderflower or similar which is sweetened only with sugar. It was reasonably priced when I bought it a few years ago.
Or you can make your own I make blackberry cordial from hedgerow blackberries with water/sugar/berry juice and store it in the fridge.
Vogel Bambu drink is like Barleycup type coffee substitute. I used to drink it and like it. The only issue is whether those are gluten free if one is on a gluten free diet. Otherwise it seems okay. I think the Bamby one in its original form was tested and found to be gluten free despite being made from gluten co training grains - must be the way they manufacture it... Though it's worth double checking if this still stand if being GF is an issue.