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I just use Vitasport electrolyte rehydration which you can get at countdown. pretty cheap and does the trick for me. Taste good too.

Energey gels can be got from Torpedo 7 etc - their a bit pricy...

I took a hard lesson when i let myself get dehydrated on an overnight trip with a long walk down to water plus i couldn’t get my breakfast in me as i basically ran out of water. Staggered back to the...