Who cares you might rightfully ask? Until yesterday not me.There was an article in the NY Times about home made Ginger Ale.I'm not technologically adept enough to provide a link to the article,but if you go to www.nytimes.com and then to the Dining & Wine section you will see it.The recipe calls for ginger juice,sugar,lime juice and club soda or seltzer.I don't know if there is any difference between the two.I Googled it but then started to doze off.But the article got me thinking about club soda,since this is by percentage the main component in the recipe.Are there any real differences between Canada Dry,the store brand,or Joe's Artisanal if there is such a thing? In the last couple of years there have been a bunch of boutique tonics to come on the market,and some bars(or cocktail purveyors if you prefer) take pride in making their own tonic.In the past 3 months I have read several articles about the importance of ice in drinks.In fact Eric Felten wrote about this last Saturday in his WSJ column "How's Your Drink?".That would be found at www.wsj.com and then the Life & Style section.Scroll down about midway to " A Chill to Scotch Purists Hearts".So all this made me wonder if there is any difference between bottle X and bottle Y of club soda or seltzer? I believe it's just water and carbon dioxide.So it seems like there would be nothing to distinguish one from another.I want to try this Ginger Ale recipe out this weekend and thought who better to satisfy my newfound curiousity about this topic than the very knowledgeable people on ChowHound.