I’ve used a variety of hydration products from cheap to very expensive. For me, it really boils down to sodium: is there enough in there? So, I am back to good ol’ Gatorade spiked with sodium citrate to bring the solution to the 1200 mg/L concentration I know I need. It’s working great, and cheap as heck.
Just search sodium citrate on Amazon and you’ll find dozens of cheap, pure product. A 1/8th teaspoon contains 400 mg of sodium - added to a standard half-liter bike bottle, that provides an 800 mg/L sodium concentration. That, plus a half-scoop of Gatorade makes a great tasting drink right at 1200 mg/L.
Sodium citrate is also great as hydration recovery aid - it doesn’t have the strong salt taste of regular table salt, so it’s easy to add to plain water if my muscles are especially twitchy after a hard ride.