I have exactly the same problem and cordial works for me. You can get low joule and fruit juice extracted cordial, so its not all bad.

I also found that ice blocks were fantastic and fruit juice versions of zooper doopers are a great way to help stary hydrated.

I would not worry about too many bubbles, anything carbonated is absorbed into your system faster anyway so is great news if you are a bit parched!

Have fun exploring the cordial ailse, Cheers