Nuun

Obviously they are evil an' all that but the cheapest I could find was via Amazon and their sorta standing order function, Subscribe & Save....Nuun Active Hydration Kona Cola Tablets - 12 Count Tablets Per Tube, Pack of 8: Amazon.co.uk: Health & Personal Care

Am off coffee atm for some oddness so the Kona Cola is kickstarting my day in the interim
That's the one flavour I don't like. Bit too metallic or too similar to those cola bottle sweets I gorged on as a kid. Which is odd considering my firm Nuun favourite is still Grape, and that's exactly the same flavour as a medicine I loved back then.

I hope your coffee withdrawal isn't too bad and the oddness gets resolved soon!