Hello Rainbow
Just searching around RootsChat and came across your message. I own the web page mentioned earlier that has details of the Dundee Aerated Water Co. As you say, there seems to be no connection between the two - except that the company founder (Henry Blackwood) was from Kirkcaldy, and my Ewings who worked there were from Dysart and Kirkcaldy.
Having said that, the Ewings do have a Todd connection too. David Ewing's paternal grandmother was Margaret Todd (1805-1881), daughter of James Todd (1770-1858) and Margaret Sinclair - these were a Dysart family, residing mainly in Gallatown. I believe James Todd's parents were James Todd and Margaret (or Helen) Stewart, m. 1767 in Dysart.
Margaret Todd had three sisters that I know of: Helen (1798-1893, m. James Buist); Jean (b.1802); and Mary (1803-1883, m. Alexander Nicolson, a local land surveyor, 1806-1848).
Just thought I'd put this up for info, and in case you recognise any connection..
Best - Garen