Nice to see someone else home-brewing their drinks! I’m mostly through my batch based on sodium bicarbonate/salt, have some sodium citrate to try next. I’ve found that ‘true lemon’ and ‘true lime’ products are good for flavoring, if you like citrus. I have mostly used commercial products for my long rides just due to convenience as I’ve been mostly solo on those.
After your initial post, I looked for ‘trenching info’, and didn’t really see much other than some mentions of the idea. For everesting there is Hall of fame | Everesting I know that there has been a lot of action on records for single everestings, I haven’t seen much talk about double everest records. I don’t see a quick way to just filter double everests, but Andy van Bergen (ie the guy behind Everesting) could likely help identify the records. A quick browse shows at least on person did a double everesting in under 18 hours 
If you sort by elevation you will see about a dozen triple everests and then you’ll see the doubles. I think for ‘official’ records they now want to pre-clear the route, as there can be real issues with the quality of elevation data with strava segments since the elevation profile that Strava uses for the segment is whatever was recorded by the person who created it.
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