Nuun

Always used to use Nuun. Seems a bit pricey though. There must be a cheaper way to hydrate...

There is, you can buy the electrolyte ingredients for Nuun (it's just 3 or 4 types of salts) for about a hundredth of the cost. Probably £20 will provide you a lifetime's worth.

You've then got to sort out some flavourings, but I doubt that's too hard.

But at this point you've a bunch of whitish powder, either in a tub or in individual portions in baggies, which is a lot less simple to use than taking a tablet from a tube and dropping it into a bidon. I suppose you could get some food grade chalk powder and a pill press and try and make your own tablets and reuse old tablet tubes.

For me, the premium of paying for High-5 Zero or Nuun is worth it for my convenience.

There's a fair amount of money you're paying for branding (and the initial R&D and testing/certification/etc). Much like paying £2.10 for 16 x 200mg tablets of Nurofen (just Ibuprofen, not the express version that contains caffeine) or the supermarket basics version for 30p. It's the same stuff at the end of the day.

You can just put some fruit juice and sea salt in your bottle.