I've diluted a half-cup of malto in an 8-oz. plastic water bottle with far less than 8 oz. of water. It took a lot of shaking, but now I have a homebrew energy gel flask, of sorts.
I think for the electrolyte potion, I'll mix up a concentrated batch to store in the fridge and dilute it into bike bottles as I go. Maybe throw in a squirt of fruit juice for flavoring so it doesn't taste like I'm drinking my own sweat.
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Thread: Homebrew electrolyte