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High-5 and SiS both do hydration stuff with little/no calories.
High-5 Zero tablets: http://www.wiggle.co.uk/high5-zero-electrolyte-drink-20-tabs/
SiS have the 'Go Electrolyte' powder (in a tub): http://www.wiggle.co.uk/science-in-sport-go-electrolyte-16kg/
or 'Hydro' tablets: http://www.wiggle.co.uk/science-in-sport-go-hydro-tablets-20-tabs/
[EDIT] You can make tubs of electrolyte powder yourself for very cheap by just buying the various salts. It's a lot harder to make the tablets yourself and they're the ones that are useful for longer rides where you get through more water than you can carry on the bike. If you just make up two bottles of electrolyte water before going out on a ride then it's much easier to make the powder up yourself and save a wodge (that 26 quid 1.6kg tub can be made for under 2 quid).
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Greenbank
What are folk using instead of Nuun?
High5 is just sugar junk
SIS gives me bad guts