Did George Lucas know that?
I don't know. There is a certain tendency in western media to overrepresent the significance of swords in pre-gunpowder combat (at least when they're not treating bows like they're guns and catapults like artillery).
On the other hand, with well-made swords often serving as a status symbol (due to being more expensive in terms of required material, labour and skill of the craftsman) it makes sense for the Jedi to wield them as a symbol of affiliation and the reputation that accompanies that affiliation. Everyone can buy a Blaster, but a Lightsaber?
Or maybe he just wanted to emphasize the mysticism around katanas.
It doesn't have to be either/or, I think both are plausible.
https://pmc.ncbi.nlm.nih.gov/articles/PMC3510389/
The study uses particularly clean water (clean enough to be suitable for medical injections) with a pH of ~7.4. At that acidity and a temperature of 20°C (≈70°F), it takes about 95 days for the vitamin C to decay to 10% of its original concentration, or 28 days to reach 50%.
Normal drinking water has a pH of 6.5-8.5, but also contains a lot of other substances, which might increase the rate of oxidation. Given the potential time between treatment and consumption as well as the fact that people might boil it and increase the rate of decay that way, it's just not as economical to add ascorbic acid to the water supply if only a small percentage of it will ever reach the consumers.
Additionally, the exact dosage will be hard to control, leading to a risk of excessive side effects such as kidney stones. People with a specific enzyme deficiency may also suffer anemia as excessive doses.
Compare that to, say, lemons, whose juice has a pH of ~ 2.4 and renders the vitamin a lot more stable. If you want people to get a good intake of vitamin C, tell them to eat fruits and vegetables, preferably uncooked. The vitamin C dosage you'll get from that will hardly lead to megadoses, unless you eat such vast amounts that you'd probably get other problems anyway.
The reason fluoride is added is that it's quite stable, safe and effective, while also being fairly cheap.