If you add sodium salt to carbonated water (sparkling mineral water), could you produce sodium bicarbonate?
Assuming $\ce{Na}$ is used to denote sodium metal and $\ce{NaCl}$ is used to denote table salt, the following reactions in water occur:

\begin{align}
\ce{Na + 2H2O &amp;-&gt; 2Na+ + 2OH- + H2(g)} \tag {1}\\
\ce{NaCl(s) &amp;-&gt; Na+ + Cl-} \tag{2}\\
\ce{CO2_(g) &lt;=&gt; CO2(aq) &amp;&lt;=&gt; H2CO3(aq) &lt;=&gt; H+ + HCO3-} \tag{3}\\
\ce{H+ + OH- &amp;-&gt; H2O} \tag{4}
\end{align}

So (1), (3), and (4) would give you sodium bicarboante if you dried the solution.  

(2) and (3) would give you just sodium chloride back if you dried the solution.