Fatbloke, I would rather not add any sulfites. We used sorbate in the lab to test different alcohol yields on mash (an assignment, not to be consumed). Would you recommend leaving it out then? Is there another good path to longevity? I plan on having some of the bottles for a long time. Some other forum members have told me that keeping mead for a long time is not a problem. I would definitely prefer to avoid geraniums
Sulphites are produced naturally by fermentation (though the ones you'd normally add, would be likely artificially produced as the natural ones wouldn't be concentrated enough).
The reason for adding both, I've already quoted. The sulphites dissipate naturally over time. If you had to add only one chem for preserving etc, then it would be best to use sulphites, as they have little to no down side. Whereas getting it wrong with just sorbate can "kill" the brew (and materials/money investment in the brew).
Yes, meads can last for years bottled, provided they're high enough alcohol. If you wanted to go "au naturel" with them, they're best bottled in champagne/sparkling wine bottles, because they can withstand many times the pressure, whereas standard Bordeaux type (or Burgundy type for that matter) are only designed for still wines.
Hell, even beer bottles would be safer than standard wine bottles.
All of the above depends on the point that the mead has got too. Yes, it'd be great if we didn't have to bother with chems, specific bottle types (for safety) etc etc, but unless you make "Sack Meads" (strong, sweet meads), and start with a gravity that will produce about the 12% ABV mark, then as it ferments, you step feed honey, allowing the ferment to progress, until it hits a point where you've exceeded the alcohol tolerance for the yeast and obtain a consistent FG (some of the best yeasts will go to 16 or 18% plus a little). What you've done there would be to produce a mead that has enough alcohol that it prevents the yeast fermenting any further. So that you could get away without using chems, though I'd still use sulphites, as a "belt and braces" thing.
It's one of those things, we get hung up on some things, especially stuff like "organic", but that can make producing some stuff very hard, unless you really want to move back to using methods/techniques similar to those mentioned in historic documents. If that is the case, then don't be surprised to have some failures. Stuff like stuck ferments, or even acetobacter getting in and turning whole batches to vinegar.