So I cant speak for my Space Shark's pet's friend, but I from Memory I know that in 94 % Ethanol the molecule at least stays active without remarkable potency loss for months.
I mean there IS something like "Liquid Acid" and therefore many people have it in vials.
But yes - it's always this question with LSD Shelf Life ...
Maybe storage in water is bad, because of Chlorine? Then this only applies to a few countries, at least not the one of my Space Shark. So this wooooulld not be a problem.
Also if the regular issue would just be non-specific oxidation then you could add Vitamin C possibly ? Or a little Melatonin or any other strong anti oxidant? ;o
Or is this then still not sufficient ... but just from my memory there MUST be something like a modest durable way to store it in solution.