Club Soda vs Seltzer vs Sparkling Water
The Similarities between Club soda, Seltzer and Sparkling water:
As far as shelf life is concerned, this means that the colder you keep the leftovers… the more gas that will remain dissolved within the liquid. For this reason, once any of these beverages are opened the bottles should be stored in the back of the fridge where they will remain the coldest and thus trap the most gas. The more gas that is trapped, the more bubbles that can be released on successive pours.
The Differences between Club soda, Seltzer and Sparkling water:
The chart below summarizes the differences between these three clear, carbonated drinks.
The most unique product, as far as ingredients and thus also in taste, is the club soda. The addition of either Sodium Bicarbonate or Sodium Citrate is why club soda is often recommended for indigestion and to wipe a stain from clothing in a pinch. This addition appears to be effective in elevating blood pH , thus helping with indigestion.  But beware, as this seemingly harmless soda may cause interactions when taken with other medications, such as antacids. 
|Seltzer||Plain Water that has been carbonated (carbon dioxide added).||For those who love carbonation, but nothing fancy.|
|Club Soda||Plain water that has been carbonated and either Sodium Bicarbonate (baking soda) or Sodium Citrate added.||Often used for indigestion. Often mixed with Scotch (as in Scotch & Soda).|
|Sparkling Water||Natural water, from a natural spring or mountain stream that is then carbonated (carbon dioxide added).||Often mixed with fruit extracts or flavors, this section of waters generally has the most variety.|